Could 4 bar static pressure prevent shower off combi getting hot enough?

[WaterTight]

Or rather it gets hot enough but only when turned to almost full hot or higher. With the taps if you turn them on a little it's very hot, turn them on full and it's almost cold.

Would a PRV be first thing to try? Or could it be something wrong with boiler?

Shower is new so not cartridge adding to issue.

Thanks

 

[rocketmanbkk]

Is it adjustable? I mean is there like a safety trigger inside that's not in the correct position?

 

[Simon F]

whats the flow and temperature rise?
whats the boiler doing when the shower is on?
is there a control to limit the flow through the shower?

 

[jtsplumbing]

Check shower installation instructions & see what Max water pressure for that shower is, some are quite low

 

[WaterTight]

whats the flow and temperature rise?
whats the boiler doing when the shower is on?
is there a control to limit the flow through the shower?

not sure
sounds like it's firing and working normally but not gas safe so not clued up enough on that side of things
nope. but it's rated for 1 bar min to 5 bar max when in use, 10 when not so presuming 4 static shouldn't be an issue? it's a mira combiforce.

 

[WaterTight]

would a flow restrictor fitted to shower hose have the same effect as fitting a PRV? even though the taps struggle (too hot when on slightly, too cold when on full) i don't think they're that fussed about them.

 

[mfgs]

You need to check the temperature rise at a certain flow rate and then make sure it matches the manufacturers instructions. Do any other taps have this problem or is it just the shower?

 

[WaterTight]

All hot outlets suffer from slight difficulty in maintaining temp and are very hot when slightly open, nearly cold when fully open.

 

[ShaunCorbs]

what size combi in installed?

 

[WaterTight]

Not sure, did look at it but don't really know what I'm looking for. It's a very small bungalow though.

 

[ShaunCorbs]

Not sure, did look at it but don't really know what I'm looking for. It's a very small bungalow though.

as normally if combi only has a flow rate of 10 (heating) and say your flow rate incoming is 20 etc it cant heat the water fast enough,

this is why it may heat the water when the tap is half closed but not when its fully open

 

[rocketmanbkk]

If all outlets are affected I'm going with its not a shower issue. Mira are very good imo.

 

[WaterTight]

as normally if combi only has a flow rate of 10 (heating) and say your flow rate incoming is 20 etc it cant heat the water fast enough,

this is why it may heat the water when the tap is half closed but not when its fully open

Yeah I was thinking something like that. They've got a boiler bloke coming to do something shortly anyway so I told them to ask him if it could be anything to do with boiler. If he says no I guess a PRV might be worth a shot?

 

[ShaunCorbs]

Yeah I was thinking something like that. They've got a boiler bloke coming to do something shortly anyway so I told them to ask him if it could be anything to do with boiler. If he says no I guess a PRV might be worth a shot?

only prob prv reduces pressure and not flow rate which i think is your problem

 

[WaterTight]

Hmm. Well since they aren't fussed about taps I guess a flow restrictor in shower would be the answer.