- Thread starter WaterTight
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- combi dhw flow might
Discuss What might make combi produce low dhw flow? in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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That's where I was heading, could even be a scaled up inline scale reducer. The long chrome thing on the left. Or has someone part turned off the flow valve to the boiler?
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Would a scaled up inline scale reducer just reduce hot flow, normally? I can check that one.
I can't do anything within boiler as not GSR.
Will check there aren't flow reducer on iso's to taps.
Given the boiler then if I managed to increase the flow would it suddenly struggle to keep water hot if taps turned on too much? At the moment water nice and hot. As I said my mum isn't too bothered and don't want to swap one problem for another but would like to increase her hot flow if I could, mainly because filling a bath would currently take a month.
I can't do anything within boiler as not GSR.
Will check there aren't flow reducer on iso's to taps.
Given the boiler then if I managed to increase the flow would it suddenly struggle to keep water hot if taps turned on too much? At the moment water nice and hot. As I said my mum isn't too bothered and don't want to swap one problem for another but would like to increase her hot flow if I could, mainly because filling a bath would currently take a month.
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Oh and is the "flow valve to the boiler" something I can check not being GSR?
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WT , yep bin the scale reducer ( at least for now) , only other thing is the flow turbine in the boiler could be prone to crud , but you would need to go in the boiler for that .
Divide the Kw rating of boiler by 3 to get expected flow in litres/min.
24Kw should give 8 litres/min. If you can confirm cold water flow to boiler exceeds 8 litres/min then problem is most likely scaled up domestic hot water heat X. Could be faulty diverter valve but in hard water area any heatX more than 6 years old is worth replacing even if problem is elsewhere. Need to be GSR.
24Kw should give 8 litres/min. If you can confirm cold water flow to boiler exceeds 8 litres/min then problem is most likely scaled up domestic hot water heat X. Could be faulty diverter valve but in hard water area any heatX more than 6 years old is worth replacing even if problem is elsewhere. Need to be GSR.
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Very helpful. Thanks all.
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I had one with a similar problem i had to strip down the whole hyroblock and clean it out as it had not been used for over a year there was a obstruction once removed all was ok 9-10 litres a minute regards kop
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The house had been vacant for a couple of months. Not sure if that could be a factor?
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