heating sizing

[parkesy_plumb]

hi guys a friend as asked me to work with him on a heating install in a fairly big house. Im not too bothered really but as its mega local i said i would help.

The house will have 15 radiators (13 double 2 single) and 3 towel rails, 2 en suite shower rooms and a main bathroom with shower and bath. 5 people living in the house.

I have never sized for a house like this and know it will require an unvented system.

What size boiler and cylinder am i looking at?

cheers

 

[Ermintrude]

300l minim. Need to know what losses for boiler size

 

[AWheating]

just do your heat loss calculations as normal. for cylinder sizing checkout MI for general guidence.

dont forget to test the mains supply before specin the system