A barn is more than just a place to store tools or house animals. Many modern barns have work areas, tack rooms, wash stalls, and even small living spaces. Hot water in a barn can make everyday chores much easier — from washing hands and cleaning equipment to providing warm water for animals in cold weather. A tankless water heater is an excellent choice because it heats water on demand, takes up little space, and can be installed in a variety of setups without the bulk of a traditional storage tank.
In this guide, we start with the top tankless water heaters for barns in 2025, then give you a detailed buyer’s guide and practical tips for installation and maintenance in agricultural settings.
Top Tankless Water Heater Picks for Barns
1. Rinnai V53DeP Outdoor Tankless Water Heater
The Rinnai V53DeP is a propane-powered unit designed for outdoor installation, making it ideal for barns with limited indoor space. It delivers up to 5.3 gallons per minute (GPM), which is enough for multiple uses at once. The durable build and reliable ignition make it well-suited for rural environments.
- Best for: Large barns with multiple hot water needs
- Pros: High flow rate, durable, weather-resistant
- Cons: Requires proper propane setup and ventilation
2. EcoSmart ECO 18 Electric Tankless Water Heater
This electric unit is a great choice for barns with reliable electrical service. It provides up to 3.5 GPM depending on incoming water temperature, enough for a wash station and handwashing sinks. Its compact design saves wall space and it has a digital temperature control for precision.
- Best for: Medium barns with shore power
- Pros: No propane required, easy to install, adjustable temperature
- Cons: Needs strong electrical supply (240V)
3. Camplux 2.64GPM Outdoor Portable Tankless
If you need a flexible option that you can move around, the Camplux portable propane unit is a great fit. It can be wall-mounted or carried to different spots around the barnyard. With 2.64 GPM, it’s good for wash stations or cleaning equipment. Easy to set up with a standard garden hose connection.
- Best for: Seasonal or mobile use in barns
- Pros: Portable, easy hookup, budget-friendly
- Cons: Should be stored indoors in freezing conditions
4. Marey GA10LP Tankless Water Heater
The Marey GA10LP runs on liquid propane and provides around 3.1 GPM, which is enough for light to medium barn use. Its simple design and manual temperature control make it easy to maintain, even in dusty or rugged environments.
- Best for: Barns without high electrical capacity
- Pros: Reliable propane heating, compact, straightforward maintenance
- Cons: No freeze protection
5. Takagi T-KJr2-IN-LP Indoor Tankless Water Heater
For barns with a dedicated indoor utility room, the Takagi T-KJr2-IN-LP is a powerful propane unit that delivers up to 6.6 GPM. It can support multiple hot water uses at the same time, making it a good choice for large barns with wash bays, sinks, and animal care areas.
- Best for: Large barns with heavy hot water demand
- Pros: High capacity, reliable brand, long lifespan
- Cons: Requires professional installation
Why a Tankless Water Heater Works Well in a Barn
In a barn environment, space is often limited, and weather conditions can be challenging. A tankless water heater solves common barn water heating problems:
- On-demand hot water: No waiting for a tank to refill
- Space savings: Mounts on a wall or can be portable
- Energy efficiency: Only heats water when needed
- Flexibility: Can be installed indoors or outdoors depending on the model
Key Considerations Before Buying
Fuel Type
Propane is popular for barns because it works in rural areas without strong electrical service. Electric models are good if your barn has a stable power source. Some portable models run on small propane cylinders for convenience.
Flow Rate (GPM)
Match the GPM rating to your expected use. For example, a single wash station may only need 2 GPM, while a barn with multiple hot water uses at once may need 5–6 GPM.
Durability
Barn environments can be dusty, damp, and cold. Look for weather-resistant materials and corrosion protection, especially if the unit will be exposed to the elements.
Freeze Protection
If your barn is in a cold climate, choose a unit with built-in freeze protection or plan to winterize the system in freezing months.
Installation Space
Measure carefully. Outdoor models need ventilation clearance, while indoor models require proper venting for propane safety.
Installation Tips for Barns
- Mount units securely on a wall away from dust-heavy areas when possible
- For propane, use proper regulators and safe tank placement
- Protect outdoor units with weather covers or enclosures
- Ensure electric units have the correct voltage and breaker capacity
- Follow manufacturer ventilation requirements to avoid hazards
Maintenance for Long-Term Performance
Tankless water heaters in barns may need more frequent checks than those in homes because of dust, dirt, and temperature swings:
- Flush the heater annually to remove mineral buildup
- Clean air intake screens to prevent blockages
- Inspect hoses, fittings, and wiring regularly
- Drain the system before freezing temperatures if no freeze protection is installed
Conclusion
For barn use, the right tankless water heater depends on your setup. The Rinnai V53DeP is a strong choice for large barns with high water demand. The EcoSmart ECO 18 is great for barns with reliable electricity. The Camplux 2.64GPM offers portability, while the Marey GA10LP is a solid budget propane option. For maximum capacity indoors, the Takagi T-KJr2-IN-LP delivers excellent performance.
Choosing a model with the right fuel type, flow rate, and durability will ensure you have reliable hot water for years, making barn work easier and more efficient all year round.