Which boiler size?

[andymac72]

Which Baxi Platinum HE Combi. 24, 28 or 33 HE A.

I want higher hot flow rate and have 10 average radiators over 3 floors.

I assume the 24 or 28 as both do max CH system of 125l. I understand that the 33 does 155l max and that a house of my size is likely to have system volume of 100l or less.

That means my assumption is the 28 HE A for the higher hot water flowrate.

Thanks

 

[Dan Robinson]

Don't see the point in going over 28kW.

 

[Agile]

That says Dan!

But he is not content with 11 litres per minute from a combi himself and instead stores about 300 litres or more of hot water all ready for his 25 li/min (?) shower!

A combi is powered based on the hot water flow rate. The basic is 24 kW. A 28 kW is littlebit better!

But no combi will power more than two HW outlets properly at the same time on an ongoing basis.

Tony

 

[Dan Robinson]

8)

Got it hobbled at the minute pending modifications. A lowly 15 l/min .

 

[dcawkwell]

With 10 radiators you need approx 15kw of heating.

It doesn't matter about the central heating volume is you add an addition expansion vessel and it will do a central heating volume of any size.
The volume only refers to what the boilers internal expansion vessel will
handle.

Even the 24kw will heat the radiators up to anything you want.