Quick Answer
Yes, you can use PEX (cross-linked polyethylene) for radiant heating in a tiny house, but it requires proper design, installation, and protection from heat damage.
Choosing the Right PEX Tubing
When selecting PEX tubing for radiant heating in a tiny house, consider a minimum of 1/2" tubing with a wall thickness of 9.5mm or 0.375". This size provides sufficient heat transfer and flexibility. Ensure the tubing is certified for radiant heating applications, such as by meeting the requirements of the CSA B137.5 standard.
PEX Tubing Installation Considerations
To prevent heat damage, PEX tubing must be installed with a minimum 1/2" clearance from any heat source, such as a hydronic boiler or heat exchanger. It’s also essential to follow good practices for PEX tubing routing, including avoiding long vertical runs and keeping loops and coils to a minimum. When installing PEX tubing in areas prone to freezing temperatures, consider adding a freeze protection solution, such as a heat source or freeze protection valves.
PEX Tubing and Manifold Design
When designing a PEX tubing system for a tiny house, consider a manifold-based system to simplify installation and maintenance. This involves installing a manifold near the heat source that distributes the heated water to various areas of the house via branching PEX tubing. The manifold should be sized according to the system’s heat output and designed to handle any potential pressure drops.
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