Comfortable, efficient heating for residential and commercial spaces. Don't fear the cold floors anymore.

Radiant Heating

What do people love about radiant heating?

  • Radiant, sometimes called under-floor, heating is a way to heat a building by circulating warm water through a network of RAUPEX® piping, typically embedded in concrete.
  • The warm surfaces radiate to the objects and people in the space, creating a comfortable environment.   
  • You don't need to step out of the shower on to a freezing tile or sit in a different part of the office to avoid a forced-air draft anymore!  
Milwaukee Art Museum radiant

Milwaukee Art Museum radiant finished


The Milwaukee Art Museum showcases fine art and an unseen masterpiece in radiant heating design.

Key benefits

 Save ~30% on your heating bills with well-designed radiant systems.

Room-by-room control
Do you like your bedroom a different temperature than your bathroom?  With radiant, you can create many zones in your building.  That means you could maintain a warm floor in a bathroom, while keeping the adjacent bedroom cooler.

Flexibility in architectural design
Architects love radiant, because you can reduce the HVAC clutter in a space. Architect Frank Lloyd Wright even used radiant in his iconic Fallingwater House.  Radiant heating is often used for floors, but can also be installed in walls and ceilings.  

Energy efficiency
Low supply water operating temperatures and large surface areas are key for reducing fuel consumption.  In best cases, the water for a radiant system is warmed by energy-efficient, condensing boilers or renewable energy sources.

How it works

Radiant heating installation

Heat emission from the human body occurs mainly via four mechanisms: radiation, evaporation, conduction and convection. Humans feel most comfortable when they can regulate at least 50% of their heat emission via radiation.  

As an example, you feel warm when you stand in direct sunlight, even on a cold day.  While the air temperature may be cold, the warm radiation from the sun feels nice.  With radiant heating, the entire floor of your home can be a warm heat source, radiating heat to warm your skin.  As an added bonus, all of the objects on the floor warm up, so no more ice cold chairs.  

Human comfort is a complex topic.  Experts at ASHRAE have developed a building standard focused on human occupancy.  Robert Bean, host of healthyheating.com also has great explanations for how all of the complexities of comfort work together. 

More about radiant installations

Commercial projects

While forced-air is essential for ventilation and humidity control, it makes sense to cover more of the building’s sensible heating load with radiant.  Water carries 3,500x more heat energy than air. HVAC designs that use a hybrid radiant and downsized/optimized forced-air system are an excellent way to address high-performance buildings, without sacrificing occupant comfort.  Radiant excels in large commercial spaces, with high ceilings.  Warehouses, hangars, schools, offices and zero energy targeting buildings are great fits for radiant. 

Residential projects

REHAU radiant heating is compatible with a variety of floor coverings, including hardwood, carpet, vinyl, ceramic, tile and natural stone.  You have flexibility with the finishes in your home, with the added comfort benefits of warm floors.  

Learn more about radiant

How does radiant make it in to so many zero energy buildings?  Watch this 8-minute webinar for more radiant background, energy efficiency and comfort topics.

View net-zero webinar

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Radiant heating articles in publication:

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