We do,.when back at the house I will check my meter.
What size and make of boiler ?
- Thread starter MattT
- Start date
To this diyer, that sounds like balancing is needed.
But it says you can override the default setting and choose one of five constant pump speeds:
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Agree with others that the last thing I'd suspect to be the problem is the kW heat output of your boiler and moreso distribution/balancing. Average 4 bed will be around 8-10kW heat loss so at a [very] rough guess from what you describe your house would have a heat loss of 12-15kW....
Flow rate to those problem radiators- have they just been tee'd off 15mm (?) somewhere where they should not have, or the 22mm(?) flow and returns. Suspicious that those problem rads are the ones in an extension, perhaps, and that you say that they get warm eventually.
I take it you don't have a magnaclean or similar anywhere?
As for the noise presumably a boiler engineer could diagnose precisely where this is coming from relatively easily (pump?).
When you say the heating performance suffers when the cylinder reheats, your system is DHW priority I'd imagine so it just stops running through the heating circuit and will divert to the cylinder coil until back up to temp.
Fundamentally CH systems really should be properly designed and balanced to match heat losses of the house so if you do refresh elements of the heating system it's worth getting someone in who knows what they are talking about and will do some heat loss calcs, appropriately size a boiler/ashp and ensure that the rads are appropriately sized for each room as well. Zones aren't necessarily the way forward, or closing down a load of rads with excessive use of TRVs at various times of day- maybe something that might be worth considering.
Flow rate to those problem radiators- have they just been tee'd off 15mm (?) somewhere where they should not have, or the 22mm(?) flow and returns. Suspicious that those problem rads are the ones in an extension, perhaps, and that you say that they get warm eventually.
I take it you don't have a magnaclean or similar anywhere?
As for the noise presumably a boiler engineer could diagnose precisely where this is coming from relatively easily (pump?).
When you say the heating performance suffers when the cylinder reheats, your system is DHW priority I'd imagine so it just stops running through the heating circuit and will divert to the cylinder coil until back up to temp.
Fundamentally CH systems really should be properly designed and balanced to match heat losses of the house so if you do refresh elements of the heating system it's worth getting someone in who knows what they are talking about and will do some heat loss calcs, appropriately size a boiler/ashp and ensure that the rads are appropriately sized for each room as well. Zones aren't necessarily the way forward, or closing down a load of rads with excessive use of TRVs at various times of day- maybe something that might be worth considering.
19 radiators means zilch
What size are the radiators- make a list and establish output by looking at say Stelrad radiator spec sheet
If the plumbing is wrong, nothing will work, not even a new boiler
Have repaired installations where plastic plumbing created such high circuit resistance, it had to be re piped. Existing boiler was not replaced. My ecotec is over 15 years old, would not think of replacing unless going to cost me a packet for repairs
Bet 5 towel rails both flow and return are at the same temperature: these rail minimal water circulation, often the lockshield is opened perhaps 1/4 turn from fully closed.
What is the delta t across HW primaries with heating on?
If you switch off HW zone, does the heating improve
What size are the radiators- make a list and establish output by looking at say Stelrad radiator spec sheet
If the plumbing is wrong, nothing will work, not even a new boiler
Have repaired installations where plastic plumbing created such high circuit resistance, it had to be re piped. Existing boiler was not replaced. My ecotec is over 15 years old, would not think of replacing unless going to cost me a packet for repairs
Bet 5 towel rails both flow and return are at the same temperature: these rail minimal water circulation, often the lockshield is opened perhaps 1/4 turn from fully closed.
What is the delta t across HW primaries with heating on?
If you switch off HW zone, does the heating improve
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