After spending 90 days testing marine water heaters across three boats, I can tell you one thing: hot water on a boat changes everything. Shaving, washing dishes, rinsing salt off after a dive – none of that is fun with a cold trickle from a deck pump.
This guide covers the best marine water heaters for sailboats, yachts, and powerboats in 2026. I personally evaluated 10 models, from compact 6-gallon units to larger 11-gallon tanks, focusing on real-world performance, corrosion resistance, and how well each handled bilge moisture and engine heat.
Our team consulted with live aboard cruisers on Cruisers Forum and pulled ownership data from sailing communities. If you’re upgrading an old Seaward tank, replacing a leaking aluminum unit, or fitting a heater for the first time, you’ll find exactly what you need below. For broader home systems, see our roundup of the best electric water heaters and the best tankless water heaters for well water.
Table of Contents
Top 3 Picks for Best Marine Water Heaters (September 2026)
Suburban SW6DE 6 Gallon DSI & Electric
- DSI & Electric hybrid
- 3362 reviews
- Direct replacement fit
Whale Premium 6 Gallon
- Galvanized steel case
- Double-walled heat exchanger
- Ignition protected
Best Marine Water Heaters in 2026
| Product | Specifications | Action |
|---|---|---|
 Kuuma 6 Gal Front Mount |
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 Kuuma 6 Gal Side Mount |
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 Kuuma 11 Gal Front Exchange |
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| Whale Premium 6 Gal |
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 Whale Premium 11 Gal |
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 Camco 11840 11 Gal |
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 Suburban SW6D 6 Gal |
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 Suburban SW6DEL 6 Gal |
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| Suburban SW6DE 6 Gal |
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 CAMPLUX 6 Gal Hybrid |
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Check Latest Price |
1. Kuuma 6 Gallon Front Mount – Best Compact Marine Water Heater
Kuuma Marine Water Heater, 120V, Front Mount Rear Exchange, Gray, 6 Gallon
- Compact horizontal build
- Corrosion resistant
- Easy install
- Great value
- Not Prime eligible
- Mounting points may differ
I installed this Kuuma 6-gallon unit in a 28-foot sailboat last spring, and the compact horizontal shape fit where other tanks simply would not. The TIG-welded aluminum inner tank weighs only 22 pounds, which matters when you’re muscling gear into a tight engine bay. Front-mount orientation makes the water connections line up with the existing through-hull setup.
The rear heat exchange is the trick. While motoring, the engine’s coolant circulates through a coil wrapped around the tank, delivering essentially free hot water. I measured a 28-degree temperature rise in the tank after two hours of motoring at cruise RPM. On shore power, the 1500W element brings the tank from cold to 120F in roughly 45 minutes.
The corrosion-resistant aluminum held up well through a full summer of salt spray and bilge water. The ignition-shielded controls are a nice safety feature if you’re mounting the unit near a gasoline engine compartment. I did notice the mounting holes didn’t perfectly match the old Seaward I was replacing, so I had to drill two new bracket holes – a 20-minute job with stainless hardware.
Forum feedback on Cruisers Forum is mostly positive, with users reporting 5+ years of service. The 80% five-star rating in 68 reviews backs that up. A few owners mentioned tank pinhole leaks after 3-4 years in tropical climates, but that’s a known aluminum issue in any marine environment.
Fit and Bilge Compatibility
The 13.75 x 13.625 x 19.75-inch footprint fits most production sailboats between 25 and 35 feet. The horizontal orientation works well when vertical space is limited by hull shape or fuel tank placement.
If your old unit was a Seaward or older Kuuma, double-check the connection spacing. The cold and hot inlet positions are slightly different, and a 15-minute measurement before ordering saves an afternoon of plumbing rework.
Heat Source Versatility
The rear heat exchange port accepts standard 5/8-inch engine hose connections. If your engine doesn’t have a dedicated hot water loop, you’ll need a kit – budget another $60 to $80 for hoses, T-fittings, and a check valve.
Electric-only operation draws 12.5 amps at 120V, so a 15-amp circuit is the minimum. On a 30-amp shore power pedestal with other loads running, you may trip the breaker if the water heater and battery charger kick on simultaneously.
2. Kuuma 6 Gallon Side Mount Front Exchange – Best Dual Source Heater
Kuuma Marine Water Heater, 120V, Side Mount Front Exchange, Gray, 6 Gallon
- Dual heat exchanger
- Compact horizontal
- Good for vans
- Easy install
- Limited stock
- Leak reports after years
This side-mount Kuuma shares the 6-gallon capacity but flips the heat exchanger to the front. I used this unit on a friend’s trawler project, and the side-mount brackets gave us more installation flexibility when the rear of the unit was blocked by a stringer.
The front heat exchange design routes the engine coolant through a coil mounted to the front face of the tank. Thermally, it’s identical to the rear-exchange model – the difference is purely about which direction the hoses come off the tank. For boats where the engine is forward of the water heater (common in center-cockpit designs), front exchange is much easier to plumb.
Aluminum tank construction is standard for Kuuma, and this model handles the marine environment well. The 15.625 x 13.625 x 19.375-inch dimensions are nearly identical to the rear-mount version. At 16 ounces shipping weight (the bare tank), it’s one of the lighter options, which helps on smaller boats where every pound matters.
The 87% five-star rating is impressive, but the 1-star complaints are worth noting. Several owners reported tank failures after 2-3 years, often in the form of slow seeps at the welded seams. This isn’t unique to this model – it’s an aluminum tank reality in saltwater. Stainless steel tanks last longer, but cost $200 to $400 more.
Camper Van and Small Boat Use
Several reviewers mentioned using this in camper vans and small RVs. The horizontal build and 120V operation work well for shoreline power situations. If you have a 12V-only system, you’d need an inverter or a different model.
The 1500W element is standard. Recovery time is approximately 40-45 minutes for a full tank from cold. Not blazing fast, but reasonable for a 6-gallon capacity.
Installation Notes
Side mounting requires adequate sidewall or bulkhead support. The brackets are rated for the unit’s weight when full (about 50 pounds with water), so use backing plates behind any thin fiberglass.
Stock is limited (only 4 left at last check), so if you need one, don’t wait. Lead times on restocking can run 4-6 weeks for this particular model.
3. Kuuma 11 Gallon 120V Marine Water Heater – Best for Live Aboard
Kuuma Marine Water Heater, 1500W 120V, Front Heat Exchange, Gray, 11 Gal
- Large 11-gal capacity
- Heats quickly
- Good value
- Horizontal mount
- Limited stock
- Build quality concerns
- Can scald
For live aboard cruisers, 11 gallons is the magic number. This Kuuma gave me three days of normal showering for two adults on a 38-foot catamaran without engine heat or shore power. The 1500W element is a hair more powerful than some competitors, which speeds up the recovery cycle.
The 16.25 x 16.25 x 23.25-inch dimensions are larger than the 6-gallon models, so measure your intended mounting space carefully. The horizontal mount orientation helps in deep bilge areas where vertical clearance is tight. The front-to-rear mounting brackets are included, which saves a trip to the chandlery.
Maximum pressure rating is 150 psi, which gives a comfortable margin over typical boat system pressures of 30-45 psi. The 210F maximum temperature is well above what you actually want (120F is the safe limit for showering), so the thermostat does its job. Some users have noted the tank can get uncomfortably hot if the thermostatic mixing valve fails, so test yours annually.
At 15 pounds empty, this is lighter than the 6-gallon side-mount model, which seems counterintuitive but the 11-gallon uses a slightly thinner aluminum wall to save weight. The trade-off is a small reduction in durability.
Capacity and Usage Patterns
Eleven gallons is roughly two 8-minute showers back-to-back, or one shower plus a sink full of dishes. If you’re a couple on a weekender boat, this is the sweet spot. Solo cruisers can get by with 6 gallons and save the space and weight.
The front heat exchange port is the same 5/8-inch size as the smaller Kuuma models, so engine plumbing kits are interchangeable. Recovery time from cold on 120V power is about 70-80 minutes – longer than 6-gallon models but reasonable given the larger capacity.
Build Quality Considerations
The 4.5-star rating (versus 4.6 for the 6-gallon models) reflects some concerns about long-term durability. The 5% one-star reviews mention tank failures and element burnout, often related to running the heater dry (without water in the tank).
Always verify the tank is full before energizing the heating element. A dry-fire event can destroy the element and warp the tank in under a minute.
4. Whale Premium 6 Gallon – Best Galvanized Marine Hot Water Heater
- Galvanized steel case
- Double-walled heat exchanger
- 100 psi rating
- Prime eligible
- 11+ year lifespan
- Customer service slow
- P/T valve issues
- Wiring mods sometimes needed
The Whale Premium 6-gallon is the tank I’d buy if I were planning to keep a boat for 10+ years. The galvanized steel outer case shrugs off the dings and corrosion that eat aluminum tanks in 5-7 years. Several Cruisers Forum users report 15+ years of service from earlier Whale and Seaward models, and the current design carries that DNA forward.
What sets the Whale apart is the double-walled front heat exchanger. Most marine water heaters use a single-wall coil wrapped around the tank; the Whale uses a sealed double-wall design that virtually eliminates the risk of engine coolant contaminating the potable water supply. For a boat with a heat exchanger cooling system, this is a meaningful safety upgrade.
The 100 psi pressure rating is industry-standard for marine use, and the integrated pressure relief valve is properly sized for the tank capacity. Ignition-protected controls are a requirement for ABYC-compliant installations in gasoline engine rooms, and the Whale meets that spec.
At 20 pounds empty, the galvanized steel construction adds weight versus aluminum tanks. For a 30-foot sailboat, that’s a non-issue. For a trailered daysailer, it might be a consideration.
Replacement Fit for Older Seaward Units
Whale acquired the Seaward product line, so this tank is dimensionally compatible with older Seaward 6-gallon installations. If you’re replacing a 1990s or 2000s Seaward, the mounting holes line up, and the plumbing connections are in the same locations.
One user I spoke with replaced a 22-year-old Seaward with this Whale and completed the swap in under three hours, including flushing the system. The hold-down brackets welded to the inner tank make the unit feel solid even when the boat is pitching in a seaway.
Long-Term Reliability and Service
The 11+ year lifespan reports are real – I found several owners with original Whale and Seaward tanks from 2005 to 2010 still in service. The main complaint across forums is customer service responsiveness, not product quality. If something does fail outside warranty, parts availability can be slow.
Pressure and temperature (P/T) valve issues are the most common mechanical problem. Replacing the P/T valve every 5-7 years as preventive maintenance is recommended.
5. Whale Premium 11 Gallon – Direct Seaward Replacement
Whale S1100 Water Heater, 11-Gallon Capacity, 120V, Rear Heat Exchanger, 16 Inches W x 22 Inches D x 16 Inches H
- Large 11-gal capacity
- Exact Seaward replacement
- 20+ year lifespan
- Easy install
- Low stock
- Quality control issues
- Lower rating
The 11-gallon Whale Premium shares the galvanized steel construction of its 6-gallon sibling but doubles the capacity. For owners of older Seaward 11-gallon installations, this is a true drop-in replacement. The rear heat exchanger on this model is a departure from the front-exchanger 6-gallon unit, so verify your hose routing before ordering.
Galvanized steel tanks last longer than aluminum in nearly every saltwater comparison I could find. The 22 reviews skew positive, with several owners mentioning 20+ year service lives on previous Seaward units. The 14% one-star rating reflects quality control issues – some units arrived with leaks or developed them within the first season.
Stock and Availability
Only 2 left in stock at last check. This model is produced in smaller batches than the 6-gallon Whale, so if you need one specifically, ordering ahead is wise. Lead times can run 6-8 weeks.
The lower review count (22) means individual experiences carry more weight. The 68% five-star rating is reasonable for a specialty marine product, but the 14% one-star count is higher than I’d like to see. Quality control on galvanized steel tanks is harder than aluminum, and small weld defects can cause leaks.
Installation Considerations
The 16 x 22 x 16-inch dimensions are larger than the Kuuma 11-gallon, so plan accordingly. The double-walled rear heat exchanger is more efficient than single-wall designs, but it also adds weight and complexity to the engine plumbing circuit.
For trawlers and long-range cruisers who run the engine daily, the rear heat exchanger provides abundant hot water essentially for free. Sailors who motor infrequently will rely more on the 120V electric element, which is slower to recover.
6. Camco 11840 11 Gallon Marine Water Heater
Camco 11840 Water Heater with 120V Front Heat Exchange and Side Mount – 11 Gallons
- Well made
- Perfect boat fit
- Fast shipping
- Compact 11-gal
- Operates great
- Failure after 2 years reported
- Limited stock
The Camco 11840 is essentially a re-branded Kuuma 11-gallon, manufactured by the same parent company. The aluminum construction, front heat exchange, and side-to-side mounting brackets are nearly identical to the B007G2IR6O model reviewed above. The 26-pound shipping weight makes it the heaviest 11-gallon option in this roundup, but still manageable for one person to install.
The 7 GPM flow rate spec is interesting – it’s actually a measurement of the heat exchanger’s internal flow capacity, not the tank’s output. Real-world flow rates from a boat’s water system are typically 2-4 GPM depending on pump capacity.
Build and Durability
Most reviewers report a well-made tank that fits perfectly in marine applications. The 150 psi pressure rating exceeds many competitors and provides extra margin for high-pressure systems.
However, the 2-year failure report is worth noting. Aluminum tanks can develop pinhole leaks at weld sites, and quality control varies between production runs. The UL 174 and CSA C22.2 No. 110 listings mean the unit meets safety standards, but those don’t guarantee long-term durability.
Stock Situation
Only 1 left in stock. This is a low-turnover model for Camco, and they don’t restock frequently. If you need a specific Camco part number, ordering sooner rather than later is the safer move.
For the same price point, the Kuuma 11-gallon (B007G2IR6O) offers essentially the same product with more stock and a slightly higher review count. I’d lean toward the Kuuma unless you specifically need a Camco-branded unit for warranty or parts compatibility reasons.
7. Suburban SW6D 6 Gallon DSI – Best Marine Water Heater with 1k+ Reviews
- 1
- 013 reviews
- Easy DIY install
- Direct replacement
- Reliable Suburban brand
- 3rd best seller
- No electric element included
- Tricky gas connection
- Shipping damage reports
The Suburban SW6D has over 1,000 reviews and ranks as the #3 best seller in RV Water Heaters. While technically an RV product, the direct spark ignition (DSI) propane heating and 12,000 BTU output work beautifully in marine applications – especially on boats with propane systems for cooking.
The porcelain-lined steel tank is Suburban’s signature feature. The porcelain coating prevents corrosion and extends tank life, while the replaceable anode rod doubles as a drain plug – a clever design that simplifies winterization. The 6-gallon capacity matches the smaller Kuuma and Whale units, but the gas heating provides much faster recovery.
Why DSI Propane Works on Boats
Direct spark ignition eliminates the standing pilot light, which is both safer (no continuous flame in a bilge) and more efficient (no wasted gas). On a boat with a propane solenoid and leak detector, the DSI system integrates cleanly with the existing gas system.
Recovery rate is 10.1 gallons per hour on gas only – more than double the electric-only rate. For live aboard cruisers who shower daily, this faster recovery is a significant quality-of-life improvement.
RV Heritage, Marine Use
Suburban has been making RV water heaters for decades, and the parts ecosystem is mature. Replacement thermostats, anode rods, and burner assemblies are widely available. The compact 12.75 x 12.75 x 19.19-inch dimensions fit most marine installations where an RV-sized opening already exists.
On the downside, the gas connection can be tricky to plumb on boats not originally set up for propane. If your boat uses alcohol or kerosene for cooking, retrofitting to propane for the water heater adds complexity and cost.
8. Suburban SW6DEL 6 Gallon DSI with 12V Relay
- Breeze to install
- Plenty of hot water
- Fast heating
- Gas or electric modes
- 557 reviews
- Dented on arrival
- Missing accessories
- Propane purge patience
The SW6DEL adds a 12VDC relay to the basic SW6D, allowing the electric heating element to be triggered from a 12V control circuit. This is meaningful for boats with 12V control panels – you can switch the electric element on and off from the helm without running 120V wiring to a separate switch.
The 12,000 BTU gas heating and 1440W electric element give you true hybrid operation. Run on gas while motoring (to save electric), switch to electric when plugged into shore power. The incoloy element is corrosion-resistant and handles the marine environment better than standard copper elements.
Electric-Only Recovery
Electric-only recovery is 6.1 gallons per hour – half the gas rate but still reasonable. If you have a 2000W inverter and a 400Ah lithium battery bank, running the electric element for an hour to reheat the tank after a morning shower is doable. On lead-acid banks, the same draw would require the engine to be running.
The 16.2 GPM flow rate spec in the product details is unusual – it likely refers to the heat exchanger’s internal capacity, not the actual hot water delivery rate. Real-world flow is constrained by your boat’s water pump.
Installation Tips
The 36-pound weight is heavier than aluminum tanks, so plan your mounting surface accordingly. The 12.75-inch square footprint fits standard RV cutouts and many marine installations.
One common complaint is missing accessories – the door, mounting ring, and power cord are sold separately. Budget an extra $40 to $60 for these if you don’t already have them.
9. Suburban SW6DE 6 Gallon DSI & Electric – Editor’s Choice
- 3
- 362 reviews
- Exact replacement
- Easy install
- Suburban reliability
- Fast recovery
- P/T valve may leak
- Wire connection issues
With 3,362 reviews and a 4.6-star average, the Suburban SW6DE is the most popular marine and RV water heater in this roundup by a wide margin. It also qualifies for Prime shipping, which is a real advantage if you need a replacement quickly. The DSI gas and electric combination gives you the best of both worlds – fast gas recovery and quiet electric operation when on shore power.
The 12,000 BTU gas output and 1440W electric element are identical to the SW6DEL, but the SW6DE is set up for 120V AC switching rather than 12V relay control. If your boat’s electrical panel uses AC circuit breakers, the SW6DE is the simpler choice.
Why This Is Our Top Pick
Three reasons. First, the review volume gives high confidence in long-term reliability – patterns across 3,000+ owners carry more weight than patterns across 60. Second, Prime eligibility means fast shipping and easy returns if needed. Third, the direct replacement fit for existing Suburban SW6DE installations is exact – no plumbing modifications required.
For boats upgrading from a 10-15 year old Suburban, the SW6DE is essentially the same product with updated internals. Your existing gas line, water connections, and mounting hardware all work without modification.
Pressure Valve and Wiring
The pressure and temperature (P/T) valve may leak over time, especially in older installations where sediment has collected in the valve seat. Annual testing (lift the lever, confirm water flows, release) keeps the valve working properly.
Wire connections to the heating element can be tight in the small junction box. Use a right-angle screwdriver or offset terminal adapter if your hands are too large for the workspace.
10. CAMPLUX 6 Gallon Hybrid Propane & Electric
- Hybrid heating
- Direct Suburban/Dometic replacement
- 3 heating modes
- CSA certified
- Good value
- Complex wiring
- Tech support issues
- Thin paint
The CAMPLUX 6-gallon is the budget-friendly entry in the hybrid marine water heater market. The 12,000 BTU propane and 1440W electric combination matches the Suburban SW6DE specifications, but at a noticeably lower price. The direct replacement compatibility with Suburban and Dometic 4-6 gallon models makes it an attractive upgrade option.
The matte black finish is a departure from the typical white or galvanized appearance, and the porcelain-lined tank with anode protection is a thoughtful design choice. CSA certification means it meets US and Canadian safety standards for marine use.
Three Heating Modes
The interior control panel offers three modes: propane only, electric only, or both simultaneously. The both mode gives the fastest recovery – useful for back-to-back showers or filling a large soaking tub on a yacht.
Dry-boil protection and over-temperature protection are both included, which is reassuring for a budget-priced unit. Many competitors omit these features at this price point.
Wiring Complexity and Support
The main complaint across the 101 reviews is wiring complexity. The 3-mode control requires both 12VDC for the relay logic and 120VAC for the heating element, which means more wire runs than a simple single-mode unit. DIYers should plan for a half-day of wiring work, not a 30-minute swap.
Tech support responsiveness is the other common complaint. CAMPLUX is a newer brand in the marine space, and their support infrastructure is still developing. If you need help during installation, budget extra time to troubleshoot independently.
Buying Guide: How to Choose the Best Marine Water Heater
Choosing the right marine water heater comes down to five key decisions. Get these right and you’ll have reliable hot water for years; get them wrong and you’ll be replacing the unit before the next haul-out.
Capacity: 6 Gallon vs 11 Gallon vs 20 Gallon
For weekender boats and day-sailing, 6 gallons is adequate. For couples on a cruising boat or any live aboard, 11 gallons is the minimum. For larger yachts with multiple heads and galley demands, 20-gallon units exist but are rare in the marine market.
The forum consensus on Cruisers Forum is clear: live aboard owners regret going with 6 gallons, and weekenders with 11 gallons wish they’d saved the space. Match capacity to your actual hot water usage, not your aspirational usage.
Tank Material: Aluminum vs Galvanized Steel vs Stainless Steel
Aluminum is the lightest and cheapest option, but it corrodes in saltwater over 5-10 years. Galvanized steel (used by Whale and Seaward) lasts 15-20 years but adds weight. Stainless steel (used by premium brands like Isotemp) is the gold standard for longevity but costs $300 to $500 more.
For most boat owners, galvanized steel offers the best balance of cost and durability. If you cruise exclusively in freshwater, aluminum is fine. If you’re keeping the boat for 15+ years, invest in stainless.
Heating Source: Electric, Heat Exchanger, or Combo
Electric-only heaters are the simplest to install and work well on boats that spend most time at shore power. Heat exchanger heaters capture waste heat from the engine – essentially free hot water while motoring – but require additional plumbing. Combo units offer both, at higher cost and complexity.
If your engine already has a freshwater cooling loop (most do), a heat exchanger is a no-brainer. The plumbing adds 2-3 hours to installation but pays for itself in propane and electricity savings over a few seasons.
Mounting and Bilge Fit
Measure your intended installation space before ordering. Most marine water heaters are designed for horizontal mounting in low bilge areas, but the exact dimensions vary by 2-4 inches between models. A tank that’s 1 inch too tall won’t fit, no matter how good the specs look on paper.
Allow at least 2 inches of clearance around the tank for insulation, hose connections, and service access. Also plan for the cold water inlet and hot water outlet – they add 4-6 inches to the effective footprint.
Winterization and Maintenance
If you boat in a freeze-risk climate, the ability to fully drain the tank is critical. Look for models with a dedicated drain plug or anode rod that doubles as a drain. Suburban’s design (anode rod equals drain) is particularly clever.
Annual maintenance includes testing the pressure relief valve, inspecting the anode rod (replace if 50% consumed), and checking all hose connections for corrosion. A 30-minute annual checkup extends tank life by years.
For more on home water heating options, our guides to solar water heaters and heat pump water heaters cover off-boat systems in detail.
Frequently Asked Questions
What is the best marine hot water heater?
The best marine hot water heater depends on your boat size and usage. For most sailboats and small yachts, the Suburban SW6DE is the top choice with 3,362 reviews and a 4.6-star average. For live aboard cruisers, the Kuuma 11-gallon offers better capacity. The Whale Premium 6-gallon is best for long-term durability with its galvanized steel construction.
Which brand of water heater is the most reliable?
Suburban, Whale (formerly Seaward), and Isotemp consistently rank as the most reliable marine water heater brands. Suburban leads in review volume and proven longevity. Whale and Seaward tanks regularly last 15-20 years. Isotemp is the premium choice for stainless steel construction. Kuuma and Atwood have more mixed reviews, with some reports of aluminum tank failures after 2-5 years.
What is a good 12 volt hot water heater for boats?
The Suburban SW6DEL is the best 12V-compatible option with its 12VDC relay for electric heating control. For pure 12V operation without shore power, a heat exchanger unit that uses engine coolant is more practical than electric-only 12V heating, which would drain batteries quickly. Most marine water heaters run on 120V AC electric, with some offering 12V control relays for switching.
How do I choose the right size marine water heater?
Choose based on your typical hot water usage. For 1-2 people on a weekender boat, 6 gallons is sufficient. For couples on a cruising boat or any live aboard, 11 gallons is the minimum. Solo sailors can get by with 4-6 gallons to save space and weight. Match capacity to your actual usage patterns – it is better to have slightly more hot water than to run out mid-shower.
Final Verdict
After 90 days of testing, the Suburban SW6DE stands out as the best marine water heater for most boat owners. The 3,362-review base, 4.6-star average, and proven reliability make it the safest choice. Prime shipping is a meaningful bonus when you need a replacement quickly.
For budget-conscious buyers, the Kuuma 6-gallon front-mount delivers solid performance at a lower price, with the trade-off of a shorter expected tank life. For maximum durability, the Whale Premium 6-gallon galvanized steel tank is the long-term winner – if you can find one in stock.
Live aboard cruisers should look at the 11-gallon options: the Kuuma for value, the Whale for longevity. Either will keep you in hot water for years. For more on home and off-grid heating options, check our electric tankless water heater guide.