How to Calculate wall hang condensing Boiler Heat output power

[ahmad odeh]

dear sir
we are purchased a 40 kw condensing boilers from “Ravenheat”( wall hange) , the boiler generate central heating and heating the domestic water , we have question about the condensing boiler power , we have found the following information in the manual :

- Type of boiler is Ravenheat HE40 Compact ,

- Central heating nominal input (kW) : 33kw

- Domestic hot water nominal input (kW): 41

we have confused that the boiler power is not 40Kw , we consider it 33kw but the Ravenheat compay consider that the boiler power is calculated according to domestic hot water input .
Our question is : which is the correct condensing boiler power ? is that power generated from Central heating or that power which is generating from heating the domestic water ?

 

[Breplum]

Welcome to the forum.
Best practice is to speak to either factory tech desk or local representative, if available in your area.
We do not have that product here in USA and there are not many UK plumbers on this site either (off the top of my head)

 

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[Jadnashua]

Only the manufacturer can say for sure, but it seems like they're rating it for the domestic hot water generation, and they may be rounding the value off as I cannot see the controls using a Kw. There will be some heat wasted into the space around the unit, but that won't help in the summer, but could when it's colder out and you wanted space heating, too.

Depending on the amount of radiation during heating the dwelling, the unit may not be able to apply the same amount of heat to the water, as it could reach the set point, so may need to cycle on/off, so the average could be lower...this is all a guess.