under sized boiler ???

[Ray Stafford]

18kw for the whole thing is crap though ray.

Why? We used to allow 8,000 or 10,000 BTUs (BTUs, not KW) for hot water, and everyone was happy.

Sure, if I had a 16kw heating load and an unvented cyl, I would opt for a 24kw boiler. But I don't think it would be miles better than an 18kw. Better, yes. Miles better? Not really...

 

[Whyme]

i wasnt getting at ya, we dont know what the usage of the cylinder is. imho that boiler isnt big enough for the maximum output at full load.

 

[Killy Bing]

i wasnt getting at ya, we dont know what the usage of the cylinder is. imho that boiler isnt big enough for the maximum output at full load.

*Whistles*

but the boiler is good enough to do the maximum load of one OR the other.

W plan hot water priority.

 

[happyflyer]

I think the return temp will be pretty low

I think the flow temp will be pretty low

 

[AWheating]

adjust the clock so the hot water comes on at a time the heating is not required.

 

[happyflyer]

adjust the clock so the hot water comes on at a time the heating is not required.

Aw you mean have hot bath in a cold bathroom or a cold bath in a warm bathroom, electrical shower will fix that

:75:

 

[Mike Jackson]

Set the water to come on an hour before the heating. If that doesn't solve the problem then there are further problems with the install.

 

[GasmanxxxR1]

What actual problem has the customer got? I agree with Ray, it should be fine. Seen this set up many a time

 

[oz-plumber]

What temperature is the boiler set too?
It could be as simple as a faulty boiler stat.
Check the flow temp and see if it correlates with the boiler thermostat setting.
You don't need much of a temperature drop for a borderline boiler to really under perform.

Oz Plumber

 

[Killy Bing]

I must have a weird way of looking at things. I suppose during the winter the heatings been next to useless most of the time its run.

if they haven't fitted a lockshield valve to the coil then it will offer next to no resistance, easily more than half the heat will run around that and give unsatisfactory performance to both. By the time the cylinder reaches temp then the heating will be going off.