How To Pressure Test

Tech Duck

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



Video Coming Soon!


If something happened during installation, PEX pipes can develop leaks, especially under constant high pressure (Luckily the HUG Hydronics In-floor Heating system is a low pressure system), so it behooves the installer, and required by code to check for leaks and repair or replace leaking pex pipes before they lay concrete. They can/should also use the test kit to hold a constant pressure during the concrete pour.

how to use the pressure test kit for pex pipes in in-floor heating


picture pf hjpw tight to clamp the pex pipes to hold 50 PSI and a picture of adding air to fill the loops

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.