Hi
Last week "dean7445" explained to me about how to work out what new boiler is best for the "flow rate".
I have added up all the current radiators, including additional radiators as there might be a change of
property layout upstairs.
That is I've added all BTU's and kW's
The reason for this post is to ask what boiler should I go for BECAUSE they are both close to the wire
regarding the flow rate - but one boiler output might struggle and the other fits comfortably.
So my flow rate is 12 litres per minute.
Total KW for all radiators = 36,044kW
Total BTU for all radiators = 123,062 BTU
Both of the following boilers are the same for Central heating output: 30kW
So I'll reduce the amount of radiators or BTU to go no higher than 30kW
(i.e. knock off over 600kW across the rads (down from 36,044kW) )
Here are the two boilers - which one would you go for.
I'd prefer to throw a small amount of money down the drain ever time its working,
if it means the boiler will not struggle OR be right on its limits every time is fires up.
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Greenstar 29CDi Classic
Central heating output: 30kW
Domestic hot water flow rate: 12.3 litres per minute at 35 degree temperature rise
(provided adequate mains pressure is available)
Designed operational flow rate 11 litres per minutes at 40 degree temperature rise.
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Greenstar 34CDi Classic
Central heating output: 30kW
Domestic hot water flow rate: 14.3 litres per minute at 35 degree temperature rise
(provided adequate mains pressure is available)
Designed operational flow rate 12 litres per minutes at 40 degree temperature rise.
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So I'm confused about;
Domestic hot water flow rate -VS- temperature rise -VS- designed operational flow rate
Many thanks in advance.
Stephen