This DIY can help you fix the following problems:

  • Figure out problems with hydronic radiant floor heating: no heat, incorrect temperature

What you need to know:

Radiant floor heating is becoming a popular option in new homes and in renovations. A heat source is installed in the floor that heats the floor itself. The warmth spreads to the solid surfaces in the room, rather than the air, so the whole room feels warmer. There are two main types of radiant heating systems: electric and hydronic. Electric systems use wire elements as the heat source, while hydronic systems use water.

This article focuses on hydronic systems, and assumes you are somewhat familiar with how your system works. If you need help with this DIY, contact us.

How to fix it:

  1. Check the valves. The main valve on the system usually has three ports: hot, cold, and mixing. Out of all three, the mixing valve is the one that most often develops problems. Adjust these valves and see if it corrects the temperature problem. You might need to have a valve replaced.
  2. Check the sensors. Injection pumping systems have temperature sensors in the flooring and outside your home. If any of these are faulty, they'll send incorrect information to the system.
  3. Check the tubing. Older systems may have cast iron or steel tubing, which can rust. If the system isn't sealed properly, it can become clogged with mould. If there is a blockage, you may need to replace the tubing. The current best option is a plastic type of tubing, which can be cleared or cleaned more easily.
  4. Check the boiler temperature. If your boiler is on all the time rather than cycling on and off, it may not have enough capacity to heat your system efficiently, so it may need to be replaced. Depending on the type of floors you're heating, you may need to confirm that your boiler is set for the correct temperature.
  5. Did you change your floor covering? If you renovated your home recently, and changed the type of flooring over your radiant heating system, you may need to adjust the water temperature to compensate. You may also need to look at a new boiler if it's not capable of running at the required temperature for the new flooring.

Still having problems? Need more help?

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