How To Pressure Test

How do you pressure test your in-floor heating system?

Unexpected problems can happen during installation. PEX pipes can develop leaks, especially under constant high pressure (but, luckily HUG Hydronics is a low pressure system!) during installation, so it behooves the installer to check for leaks and repair or replace any leaking PEX pipes before laying concrete. Not only is this easy to do, it is required by code. It is also recommended to use the test kit to ensure a constant pressure is held during the concrete pour.

How to pressure test the Pex:

  1. Install the end cap hose starting at the input side of your first loop with a clamp (All blue hoses should  be pushed onto PEX at least ¾” and clamps need to be tightened with pliers)

  2. On the return end of your first loop, install a blue hose with clamp.

  3. Connect the other end of the blue hose to the input side of loop 2 and add a clamp (make sure the blue hose doesn’t kink).

  4. Add another blue hose with clamps from the return of loop 2 to the input of loop 3.

  5. Continue this process until all your loops are connected and you have 1 hose at the end without anything connected to it.

  6. Push the pressure gauge onto the last hose and install a clamp.

  7. Double check to make sure all your clamps and fittings are tight, secure, and that there are no kinks in any of the blue hoses. 

  8. Add air from 30 to 50PSI.  Monitor air for at least 30 minutes.  Check local codes.

  9. If there is a leak you will have to test each loop individually to find the leak. Repair the leak and retest.