Best Tiny House Water Heaters

When living in a tiny house, every square inch matters, and choosing the right water heater is crucial for both comfort and efficiency. The perfect tiny house water heater balances size, energy consumption, and performance while fitting your specific needs and lifestyle. Whether you’re building a new tiny home or upgrading an existing one, selecting the right water heater can make a significant difference in your daily living experience.

In this comprehensive guide, we’ll explore the top water heaters for tiny houses, examining their features, benefits, and potential drawbacks to help you make an informed decision for your compact living space.

1. PrecisionTemp RV-550 NSP

The PrecisionTemp RV-550 NSP consistently ranks as one of the most popular water heaters among tiny house dwellers. This propane-powered tankless water heater is specifically designed for small spaces and mobile applications.

Key features include:
– Compact size (12.5″ × 12.5″ × 14.5″)
– Propane-powered efficiency
– Flow rate of 1.5 gallons per minute
– BTU input of 55,000
– Built-in freeze protection
– Vents through the floor

The RV-550 is particularly well-regarded for its ability to maintain consistent water temperature regardless of flow rate changes. Unlike many tankless heaters that struggle with temperature stability when water flow fluctuates, the PrecisionTemp uses advanced technology to deliver steady hot water.

Many tiny house owners appreciate that it doesn’t require electricity to operate the main functions, making it ideal for off-grid situations. However, at around $1,100, it represents a significant investment compared to some alternatives.

2. Rinnai V53DeP

The Rinnai V53DeP is a premium option for tiny house owners who prioritize performance and reliability. This propane tankless water heater offers:

– Compact wall-mounted design
– 5.3 gallons per minute maximum flow rate
– 120,000 BTU input
– Temperature range of 98°F-140°F
– Indoor or outdoor installation options
– Digital temperature controller

The V53DeP stands out for its impressive flow rate, which allows for simultaneous hot water usage in multiple fixtures—a luxury in tiny living. Its digital temperature controls provide precise adjustments, and the unit is built to last with quality components.

While this model requires both electrical and propane connections, its energy efficiency often offsets the initial investment over time. Installation requires professional venting, which should be factored into your planning and budget.

3. Eccotemp L10

For tiny house owners on a budget, the Eccotemp L10 offers an affordable entry point into tankless water heating:

– Portable design
– 2.6 gallons per minute flow rate
– 75,000 BTU input
– 20-minute automatic shutoff timer
– Battery-powered ignition (2 D cell batteries)
– Outdoor installation only

At around $250, the L10 is significantly more affordable than premium options. Its portable nature makes it versatile for tiny houses that may relocate frequently. The unit is designed for outdoor installation, which can be an advantage for saving interior space but may present challenges in colder climates.

The automatic shutoff timer is a safety feature but means it’s not ideal for longer showers or continuous use applications. Many tiny house owners use this as an entry-level option before upgrading to more permanent solutions.

4. Camplux 5L Portable Propane Water Heater

The Camplux 5L is another budget-friendly option that offers good performance for tiny house applications:

– Compact and lightweight (11.4 lbs)
– 1.32 gallons per minute flow rate
– 28,000 BTU input
– 5-45 PSI water pressure range
– Battery-powered ignition
– Oxygen depletion sensor for safety

This portable unit is particularly suitable for tiny houses with modest hot water needs. Its lower flow rate means it’s best for single-fixture use rather than supplying multiple outlets simultaneously.

The Camplux includes several safety features, including flame failure protection, anti-freezing protection, and overheating protection. At approximately $150-$200, it represents one of the most economical options for tiny house water heating.

5. Stiebel Eltron Tempra 15 Plus

For tiny house owners with access to reliable electricity who prefer to avoid propane, the Stiebel Eltron Tempra 15 Plus offers an excellent electric tankless option:

– Sleek, compact design (16.6″ × 14.5″ × 4.6″)
– 1.5 gallons per minute at 40°F rise
– 14.4 kW power consumption
– Advanced flow control technology
– Silent operation
– No venting required

The Tempra 15 Plus features sophisticated temperature regulation that automatically adjusts power output based on flow rate and incoming water temperature. This results in consistent hot water delivery without temperature fluctuations.

While electric tankless heaters require substantial electrical capacity (typically 60-amp service), they eliminate the need for propane storage and venting. This model is ideal for grid-connected tiny houses with adequate electrical service.

Comparison Table of Tiny House Water Heaters

Tiny House Water Heater: Pros, Cons and Mistakes

When selecting a water heater for your tiny house, understanding the broader considerations can help you avoid common pitfalls.

Pros of Tankless Water Heaters for Tiny Houses

– Space efficiency: Tankless models take up minimal space compared to traditional tank heaters
– On-demand hot water without wasteful standby heating
– Longer lifespan (typically 15-20 years versus 10-15 for tank models)
– Energy efficiency, especially for intermittent use patterns
– Potential for endless hot water (within flow rate limitations)

Cons to Consider

– Higher upfront cost compared to tank models
– Installation complexity, often requiring professional help
– Limited flow rates may restrict simultaneous hot water usage
– Propane models require adequate ventilation and fuel storage
– Electric models demand substantial electrical capacity

Common Mistakes to Avoid

1. Undersizing the unit: Many tiny house owners choose units that are too small for their actual needs, resulting in tepid water during peak usage.

2. Overlooking installation requirements: Proper venting for propane models and adequate electrical service for electric models are essential considerations often missed during planning.

3. Ignoring climate considerations: Water heaters perform differently in various climates. In colder regions, incoming water temperature is lower, requiring more heating capacity.

4. Neglecting maintenance: Tankless water heaters require periodic descaling, especially in hard water areas, to maintain efficiency and longevity.

5. Failing to account for off-grid limitations: If your tiny house is off-grid, carefully consider power requirements and availability before choosing an electric model.

Conclusion

Selecting the right water heater for your tiny house involves balancing multiple factors including space constraints, energy sources, water usage patterns, climate, and budget. The PrecisionTemp RV-550 NSP remains a popular choice specifically designed for small spaces, while the Rinnai V53DeP offers superior performance for those with higher hot water demands. Budget-conscious buyers might consider the Eccotemp L10 or Camplux 5L, while the Stiebel Eltron Tempra provides an excellent electric alternative.

Before making your final decision, carefully assess your specific needs, installation capabilities, and long-term usage patterns. The ideal tiny house water heater is one that provides reliable hot water while fitting seamlessly into your unique tiny living situation. With the right water heater in place, you can enjoy the comfort of hot water without sacrificing precious space or energy efficiency in your tiny home.