Hi all,
New to this forum but hoping you could give me a hand with some issues I'm having with my UFH.
I bought a house in Nov last year that has wet UFH in a kitchen extension. It's a relatively small area with only 2 loops, total 90m piping and 2-port manifold. Manifold model is Wunda Premium with it's own gate valve and pump.
The main issue with this is that the mixer valve 'sings' very loudly when it is allowing hot water from the boiler into the manifold - so much so that it wakes me up at night.
Second issue is that it causes the boiler to cycle in bursts of a few minutes at a time, and it overshoots it's set temp (the CH water temp) by quite a bit, before dropping back to a more reasonable number. The boiler pump stays running the entire time the UFH is on.
The boiler is a Baxi Duo-Tec 24kw. There are 2 loops from this, one to the 5 radiators in the house and one to the UFH, controlled independently by separate thermostats.
If the radiator loop is on at the same time as the UFH, there is no singing and the temp on the boiler is constant with no cycling.
Of note, there is no ABV between the flow and return to the boiler (although I gather there is one built into the boiler).
I have flushed and cleaned the whole system (radiator and UFH), replaced the mixer valve on the UFH twice and fiddled endlessly with the boiler CH temp with no success.
My thoughts are that there is not enough return flow to the boiler when just the UFH is on, probably due to the lack of a ABV, and the demand on the system is very low causing the boiler to cycle.
I think the singing is due to the pressure of the water through the mixer valve (particularly as it doesn't happen when the radiators are on) - again something which I *think* an ABV would cure.
Am I on the right lines here or totally off course? Any help much appreciated. Thanks!
New to this forum but hoping you could give me a hand with some issues I'm having with my UFH.
I bought a house in Nov last year that has wet UFH in a kitchen extension. It's a relatively small area with only 2 loops, total 90m piping and 2-port manifold. Manifold model is Wunda Premium with it's own gate valve and pump.
The main issue with this is that the mixer valve 'sings' very loudly when it is allowing hot water from the boiler into the manifold - so much so that it wakes me up at night.
Second issue is that it causes the boiler to cycle in bursts of a few minutes at a time, and it overshoots it's set temp (the CH water temp) by quite a bit, before dropping back to a more reasonable number. The boiler pump stays running the entire time the UFH is on.
The boiler is a Baxi Duo-Tec 24kw. There are 2 loops from this, one to the 5 radiators in the house and one to the UFH, controlled independently by separate thermostats.
If the radiator loop is on at the same time as the UFH, there is no singing and the temp on the boiler is constant with no cycling.
Of note, there is no ABV between the flow and return to the boiler (although I gather there is one built into the boiler).
I have flushed and cleaned the whole system (radiator and UFH), replaced the mixer valve on the UFH twice and fiddled endlessly with the boiler CH temp with no success.
My thoughts are that there is not enough return flow to the boiler when just the UFH is on, probably due to the lack of a ABV, and the demand on the system is very low causing the boiler to cycle.
I think the singing is due to the pressure of the water through the mixer valve (particularly as it doesn't happen when the radiators are on) - again something which I *think* an ABV would cure.
Am I on the right lines here or totally off course? Any help much appreciated. Thanks!