by cercleforet »
Wed Dec 10, 2008 7:18 am
[quote="Steve the gas"]Hi,
The hot water requirements is the way good installers match a boiler to a client.Which boiler do you have and what is its output for HW in litres/minute?
If your bathroom is quite a distance from the boiler then you could slow the rate you fill a bath and see the result.
De sludgeing/ scale removing could help if heat ex is scaled up, but not at that price -- shop around.
Steve[/quote]
The boiler is a Protherm 80e
Flow rate @ 30 deg C temperature rise ….11.2 l/min
@35…………………………… 9.6 l/min
Minimum water flow……………………….2 l/min
Max/min supply pressure……………………6/1 bar
Full technical details are at
http://www.postimage.org/image.php?v=gx1mujcr
The bathroom is immediately above the kitchen, where the combi is located, so in theory it is quite close to the boiler. As I said in the OP, I can get bath hot water only if the hot tap is turned no more than about 10 deg: more than that the water runs alternately hot and cold until eventually at full aperture the flow is more or less cold.
I did not actually quote a price for the power flush and descale. For clarity the power flush and descale quote was £450 and a new boiler £2185 inclusive of VAT and the foregoing. BTW I live in S.W Hants, where prices do tend to be high
[quote="nitro23456"]Make and model of boiler?
Most heat the water within the main heat exchanger and sludge is unlikely to be the cause if this is the case - is the boiler noisy?
One possibility is that the pump is not running on DHW.
Obviously a competent boiler engineer would check the temperature sensors, flow rates and do a thermal survey to assist with diagnosing the cause of your problem.[/quote]
Noisy? If you mean clunks and grunts, then I’d say it was not, but it does roar, We can hear it sitting out in the garden
Not ruining on DHW? Is there a quick way to tell?
:)
