My FH boiler is on the roof, making it troublesome to add glycol mixture to the tank. So, when the system was installed we added a filling port in the return piping. To initially fill the system, a
Flojet was used to pump the approximately 90 gallons of glycol mixture into the plumbing.
When the system started leaking I automated the “Keep Full” by placing a 30 gallon drum near the filling port. A float switch was added to the boiler’s expansion tank. A solenoid valve is activated by the float switch. The solenoid valve supplies compressed air to the
Flojet. The
Flojet pumps the glycol mix from the drum into the FH filling port.
So, to add the Fix-a-Leak to the system I simply inserted the
Flojet’s inlet hose into the quart bottle and energized the solenoid. The floor heat pumps were then forced to run constantly. The boiler was not disabled during this time, so the system maintained the return fluid setpoint at 70 degrees.
After 48 hours I returned the circulating pumps to automatic and the system was allowed to cycle normally…off at 38 degrees outside air temperature. We’ve had daytime temps into the 50s and nighttime temps down to low 20s during the past week.
After a week, the glycol reservoir has remained full indicating the system is no longer leaking.
As to how it works??? Beats me. The product is a thick viscous liquid…kinda looks like thin silicone sealer. The only orifice that might get clogged would be the pressure gauge and since there’s no pressure on the system I don’t care about that gauge.
Additional 411…
My system is old black poly pipe (sprinkler pipe?) and new PEX…I suspect the old poly to be the leaker.
I flushed the
Flojet with a gallon of glycol mixture after pumping the Fix-A-Leak…and tested it yesterday to make sure it was still functioning.
I purchased the Fix-A-Leak from a local Pool and Spa business…it’s also available online…search “Marlig Fix-a-Leak”.