Higher rate boiler?
- Thread starter CrazeUK
- Start date
Yawn.
Back to the OP
I would probably be looking at keeping the two boilers as you always have a back up should one fault.
Two boilers totalling about 36 should suffice and cover the addition of the 3 rads to be added basement area.
Unvented cylinder (as combination boiler is totally inappropriate for your type of property) with a DHW return in place.
Possibly a LLH setup to separate DHW/HTG
Zone each floor for increased efficiency.
Hard to design a system without seeing it but something similar to the above would suit I would've thought.
Jon
I would probably be looking at keeping the two boilers as you always have a back up should one fault.
Two boilers totalling about 36 should suffice and cover the addition of the 3 rads to be added basement area.
Unvented cylinder (as combination boiler is totally inappropriate for your type of property) with a DHW return in place.
Possibly a LLH setup to separate DHW/HTG
Zone each floor for increased efficiency.
Hard to design a system without seeing it but something similar to the above would suit I would've thought.
Jon
Hi, So there are:
6 bedrooms
2 lounges
2 hallway heaters
1 kitchen
2 bathrooms
+ 3 potentials for basement.
So 13 over 3 floors, at a push 16 over 4 (earlier i forgot to add the hallway rads).
Thanks
The Baxi Whole House Boiler Size Calculator is a computerised version of the above document and is much easier to use.
OK so with 16 rads now, 40kw may not necessarily be overkill. A proper heat loss calc would need to be done but I would still separate the total load over 2 boilers as this will allow for potential breakdowns and also offer savings as the boilers will be able to turn down to a lower kw if required as the system gets to temperature.
Pump in a standard boiler would probably not be up to the job so right pump sizing would be needed.
As said before
2 x heat only boilers
Unvented cylinder with DHW return for instant hot water
LLH separating DHW/HTG no need for hot water priority then and heating can remain on during reheat. Boilers operate at optimal efficiency due to being able to get the flow rates right through the boiler and not creating a massive temperature differential across flow and return.
Correctly sized pumps across primary and secondary circuits.
Each floor zoned and then possibly smart controls if you desire.
Should give you a highly efficient system that will give you mains pressure hot water instantly to your taps without loss of pressure should multiple outlets be used, the ability to zone off areas of the house not in use to cut costs and back up for both heating and hot water should one boiler breakdown and still have hot water should they both fail.
Again this is just guesswork from a forum and would need to be checked on site including pressures and flow rates as Picasso mentioned earlier but I don't think that system would be far wrong to keep you happy and warm.
Jon
Pump in a standard boiler would probably not be up to the job so right pump sizing would be needed.
As said before
2 x heat only boilers
Unvented cylinder with DHW return for instant hot water
LLH separating DHW/HTG no need for hot water priority then and heating can remain on during reheat. Boilers operate at optimal efficiency due to being able to get the flow rates right through the boiler and not creating a massive temperature differential across flow and return.
Correctly sized pumps across primary and secondary circuits.
Each floor zoned and then possibly smart controls if you desire.
Should give you a highly efficient system that will give you mains pressure hot water instantly to your taps without loss of pressure should multiple outlets be used, the ability to zone off areas of the house not in use to cut costs and back up for both heating and hot water should one boiler breakdown and still have hot water should they both fail.
Again this is just guesswork from a forum and would need to be checked on site including pressures and flow rates as Picasso mentioned earlier but I don't think that system would be far wrong to keep you happy and warm.
Jon
40 kw into 16 rads?
That's an average of 2.5 kW per rad!
Some massive rads there!
I would expect more like 24 kW.
I use the annual gas consumption as a guide to what the actual heating needs have been.
Is it detached or terraced?
Tony
That's an average of 2.5 kW per rad!
Some massive rads there!
I would expect more like 24 kW.
I use the annual gas consumption as a guide to what the actual heating needs have been.
Is it detached or terraced?
Tony