DIY Radiant Heat Supplies | Hydronic Radiant Floor Heat

Let's go over a few of the DIY radiant heat supplies you will be needing for a closed loop hydronic radiant floor heating system with domestic water. This is a radiant heating setup which utilizes your domestic hot water tank as a heat source for the in floor or radiator heating as well.

Radiant Heat Supplies:

-Hot Water Tank
-Flat Plater Heat Exchanger (FPHE)
-Circulating Pump
-Valves and Checkvalves
-Expansion Tank
-Manifolds
-PEX tubing or Radiators
-Brackets, Clamps and Fittings

If this is a renovation, then you will already have a traditional hot water tank in place. If this is a new installation, you will need to get one. It is better to have a larger capacity tank. Too small of a tank will mean it is constantly working, trying to keep up to demand.

The heated water flows from the water tank to a Flat Plate Heat Exchanger, and loses it's heat into the radiant heating system's fluid through the FPHE. The now cool water returns to the hot water tank to be heated yet again. At any time someone in the house can open a tap and this hot water will flow there instead.

The reason for the FPHE is to keep the domestic water fresh and completely separate from the heating system fluid, which circulates endlessly in a loop. The water leaves the FPHE warmed up, and the circulating pump moves it along through the PEX tubing, radiators or other radiant heating devices. As it passes through these, it loses it's heat. This heat then radiates through your floor and house.

Other radiant heat supplies are one way valves or check valves to prevent water flowing backwards at any point. You always want the hot water moving forward through the loop in the same direction.

There will also be an expansion tank in the heating system loop. This tank will allow expansion due to heating and cooling of the fluid a place to go, without rupturing or stressing any of your tubing, pipes or other components. As such, it is a very important piece and without it the entire diy radiant heat system might fail and have a leak.

Supply and return manifolds split the water into multiple lines for different PEX tubing loops or radiators. There should be a temperature gauge, a pressure gauge and a bleedoff valve or device to remove air from the system.

A variety of clamps, fittings and brackets round out your radiant heating supply needs. There are special clamps to connect the PEX tubing to the fittings.

This is a general guideline of radiant heat supplies you will need for your diy radiant heat installation. For more detailed information, visit a local plumbing shop or supplier. This will be the best place to pick up supplies for your hydronic radiant floor heat system.