DIYbanter - View Single Post

Doug Miller

In article , wrote:
I have an apollo heating system;which uses hot water to heat with.
my pressure relief valve is dripping.because it is an apollo system
the valve must be replaced by an apollo relief valve. my question is:
how dangerous(?) is waiting for 10 days until i return from a trip
that
is neccessary? the dripping occurs when there is NO call for heat.
also the dripis not a gushing flow of water,just a drip like a faucet.

The problem may not be your pressure relief valve at all. Most hot water
heating systems have a fill valve to supply make-up water from the building's
plumbing system, in combination with a pressure reducer. The pressure reducer
may have failed, allowing too much pressure into the heating system.

The diagnosis is simple: close the fill valve. If the relief valve stops
dripping, the problem is the pressure reducer.