Best boiler to run 13 rads.

[hawesside]

Hi, I need to change my old combi central heating boiler and would like to know what Combi Boilers C.H fitters recommend.
I have a four bed house with 13 radiators with an output of approx 22,000 watts ( 75,000 BTU's). I put my rad sizes into an online calculator and got these figures. I may want to add another rad in the attic in the future so need a boiler to accommodate this. I will need to get an installer to fit it but thought I would enquire what is recommended first.

 

[ShaunCorbs]

What's your hot water cylinder

But speak to your installer but as an aprox 32-42 kw

 

[hawesside]

Hi ShaunCorbs, I forgot to say it was a Combi Boiler that I need.

 

[Chalked]

How many bathrooms have you?

What has your gas installer reccomend?

 

[hawesside]

Hi Chalked, Just one downstairs bathroom. I have not contacted an installer yet as I am just after some ideas of best boilers first.

 

[ShaunCorbs]

Hi ShaunCorbs, I forgot to say it was a Combi Boiler that I need.

Combi boilers are sized on hot water delivery and flow rates, not heating output

Worcester
Viessmann
Atag

 

[joni os]

As above 32Kw will be adequate for heating but flow rate of hot water is directly related to boiler power. For a 4 bed house with two bathrooms, even a combi. in excess of 40Kw might struggle to meet demand, making an unvented cylinder a suitable alternative.

 

[hawesside]

Combi boilers are sized on hot water delivery and flow rates, not heating output

Worcester
Viessmann
Atag

Now I am totally baffled by what flow rates I need !

 

[ShaunCorbs]

Now I am totally baffled by what flow rates I need !

That's where your gas safe engy comes into play