If you’re selecting an LP boiler to power radiant floor heating, this guide highlights five strong options and explains who each is best for. These choices prioritize reliability, space efficiency, and energy performance. The top picks cover combination heating, standalone boilers, and electric floor heating mats for controlled comfort. This overview helps buyers compare options quickly and choose the right match for their home or small commercial space.
| Product | Best For | Key Benefit |
|---|---|---|
| Rheem RTG Series 8.4 GPM | Large homes with multiple simultaneous hot-water needs | High output with 0.82 UEF and on-demand performance |
| Rinnai IP090199C I-SERIES Plus 90k BTU | Combined hot water and space heating | High efficiency and integrated control with Smart Sense |
| Mr. Heater 30,000 BTU Vent Free | Smaller spaces or supplemental heat | Simple vent-free radiant heat for quick warmth |
| Electric Radiant Floor Mats 30 Sq.ft | Low-profile, easy install for bathrooms | Programmable thermostat with floor and air sensors |
| Rinnai IP090S I-SERIES Plus 90k BTU | Compact boiler with flexible fuel options | High AFUE and smart home integration |
Rheem RTG Series 8.4 GPM Liquid Propane Tankless Water Heater
Best for large homes with multiple simultaneous hot-water points. The Rheem RTG delivers 8.4 GPM at a 35°F rise, equating to about 180,000 BTU/hr. It is an indoor, non-condensing unit designed for energy-efficient on-demand heating and space-saving wall installation. This model suits households where several showers or appliances run at once. Its 0.82 Uniform Energy Factor (UEF) supports lower energy costs compared with older electric tanks. A direct-vent system enables indoor installation with proper venting. Caution: non-condensing units can require regular vent maintenance and proper vent sizing for optimal efficiency.
Rinnai IP090199C I-SERIES Plus 90k BTU Condensing Combi Boiler
Best for homes needing both hot water and space heating from a single unit. This combi boiler supports natural gas or propane and uses a 96% AFUE rating for efficient operation. It provides robust hot water supply while delivering reliable heat for heating needs. Smart Sense Gas Valve technology allows precise energy management, and Bluetooth-enabled control offers easy integration with smart-home ecosystems. Choose this if you want a compact, multi-function solution that reduces equipment clutter. Limitation: combi boilers may require careful sizing to match peak heating and hot-water demand.
Mr. Heater 30,000 BTU Vent Free Radiant Propane Heater
Best for supplemental heat in smaller spaces or as a backup heat source. This vent-free unit delivers 30,000 BTU per hour and can heat areas up to about 1,000 square feet. It uses a battery-operated electronic ignition for easy startup. Caution: Vent-free heaters require proper room ventilation and adherence to safety guidelines to avoid combustion byproducts accumulating indoors. Best used where direct, rapid warmth is desired without running extensive ductwork.
Electric Radiant Floor Heating System, 30 Sq.ft
Best for bathrooms and small rooms where direct electric floor heating is preferred. The system includes a 30 sq. ft. mat with a programmable thermostat and floor sensor, suitable for installation under tile or laminate. It operates at 120V, 3.0 amps, and 12W per square foot, with CSA-certified cables safe for wet locations. Choose this when you want precise floor temperature control and quick warm floors. Limitation: electric mats may require careful floor preparation and can be slower to heat large areas.
Rinnai IP090S I-SERIES Plus 90k BTU Condensing Solo Boiler
Best for compact installations needing reliable high-efficiency heating with flexible fuel options. The IP090S offers up to high AFUE efficiency with Smart Sense Adaptive Gas Valve technology and Bluetooth connectivity for app control. Its compact design supports versatile residential or commercial installations without sacrificing performance. Best used where space is at a premium and smart-home integration is desired. Caution: ensure proper venting and installation clearances per local codes.
Buying Guide
What type of radiant floor heat system are you planning? For hydronic radiant floors, a boiler paired with a heat exchanger or a tankless system can work, whereas electric mats are simpler for specific zones. Consider the following:
- Heat demand and household size: Large homes with multiple baths benefit from higher GPM or BTU output and on-demand hot water.
- Fuel type compatibility: LP gas systems require venting and proper venting clearance; some models support dual fuel (natural gas or propane).
- Efficiency metrics: AFUE and UEF ratings indicate energy savings; higher percentages generally mean lower operating costs.
- Installation and space: Compact, wall-mounted units save floor space; consider indoor vs. vented installation requirements.
- Smart controls: Models with Bluetooth or apps offer easier thermostat management and integration with smart homes.
- Maintenance needs: Condensing vs. non-condensing units have different venting and corrosion considerations; plan for routine service.
Frequently Asked Questions
- What is the advantage of a condensing boiler for radiant heat?
It typically achieves higher efficiency by recovering heat from exhaust gases, lowering energy use. - Can I use an LP boiler for radiant floor heating in any home?
Yes, but ensure proper venting, clearances, and compatible floor heating components. - Is a tankless system better than a traditional tank for radiant floors?
Tankless models provide on-demand hot water with space savings, but sizing is critical for simultaneous loads. - Do I need a separate thermostat for radiant floors?
Many systems include programmable thermostats; some setups may benefit from floor-sensing thermostats for even heat distribution. - Are electric radiant mats suitable for bathrooms?
Yes, but ensure CSA-certified components and proper wet-location ratings for safety. - What should I consider when mixing boilers with smart-home devices?
Look for Bluetooth or app integration and compatibility with your existing smart ecosystem.