what boiler

[tbag19]

hi just need some advice on boilers my central heating system runs off a cold water tank in the loft I have no hot water tank as my water is heated instantly from another boiler.i have been looking at a Worcester greenstar 12ri regular boiler and I need to know if it will run off my cold water tank without having to fit an hot water tank many thanks.

 

[PDPlumb]

Do you just want to heat radiators?

 

[tbag19]

yes just need to heat the radiators hot water is heated rom another boiler

 

[joni os]

Regular boiler doesn't know what its heating, that's determined by presence, or in your case absence, of motorized valve. Keep it simple, and if all rads are on TRVs make sure you have a bypass.