Heating system

[yebaws]

Hello,

Planing a new small wet heating system with a mid point valve, 4 radiators and one indirect HW cylinder. All on the ground floor and within a property no bigger than 15 x 15m. I plan to have separate 22mm primary flow pipes for the CH and the DHW, but to have a shared return pipe for the CH and the DHW. Would it be OK to have the return in 22m also or should this be 28mm?

Thanks.

 

[Boilerman2]

You can keep the return in 22mm, but the HW return must be nearest the boiler to avoid reverse circulation

 

[D_Hailsham]

All on the ground floor and within a property no bigger than 15 x 15m.

That's a large property (50ft square). Presumably it's a flat.

Have you done a heat-loss calculation? If so, how many kW do you need for heating?

 

[yebaws]

All on the ground floor and within a property no bigger than 15 x 15m.

That's a large property (50ft square). Presumably it's a flat.

Have you done a heat-loss calculation? If so, how many kW do you need for heating?

OK, going back to measure now, it's more like 6m x 11m. Sorry. That's what happens when you do things off the top of your head. Yes, I have done a calc for the rads (they are replacing electric storage anyway, so it is easier to work out the require Kw. - 20Kw in total, including the DHW.

 

[D_Hailsham]

it's more like 6m x 11m. ... I have done a calc for the rads (they are replacing electric storage anyway, so it is easier to work out the require Kw. - 20Kw in total, including the DHW.

20kW sounds a lot, I only need 15kW for a two storey house 6m x 11m.

Use Baxi Whole House Boiler Size Calculator to find out what size boiler you really need.