Central Heating.. Expansion pipe remote from boiler

[bernardgreen]

Need advice on plumbing a vented heating system in a difficult building.

Main building is 490 year old grade II lsited thatched stone cottage. Fitting a boiler into it is nigh on impossible ( walls 2 foot thick and minimum clearance between flue terminal and thatch cannot be achieved.

A single story brick kitchen is attached and this is where the boiler will have to be located to achieve clearance from the thatch.

Header tank needs be in cottage to achieve necessary head.

The problem is the only route for pipes from kitchen into the main building is less than 2 feet above kitchen floor level. ( stair case inside cottage prevents anything higher )

Pump needs to be under the boiler to feed second hot water tank and radiator in the kitchen.

Which is the best ( compromise ? ) method to connect feed and expansion into the flow and return ?.

A pressurised system is not a prefered option.

Untitled

• bernardgreen
• 26 Sep 2011
• 1

Untitled

• bernardgreen
• 26 Sep 2011
• 1

 

[Youllneverguess]

What have you against a pressurised system?

 

[kevindgas]

so long as the F&E are before the pump and close to each other then it should not be a problem.

so i'd go with a F&E at the cylinder on the return and the pump somewhere on the low section in the kitchen again on the return

 

[bernardgreen]

Kevin

That was my idea but one boiler manufacturer insists the pump MUST be on the flow from the boiler. With hint that the warranttee would not be honoured if a fault occured and the pump was in the return.

One other related question. Is there such a thing as a 22 to 15 reducer where the 15 can extend beyond the reducer and into the 22 mm. The common ones all seem to have a ridge inside that prevents the 15mm going too far into the reducer.

 

[bernardgreen]

What have you against a pressurised system?

Personally in general nothing but for this project there will be some custom built "radiators" and it will complicate the fabrication of them if they have to be "proofed" as safe for a sealed system with the hazard of the system being accidently over pressured. With the vented system the maximum pressure is 0.3 bar ( 10 feet of head ) and no hazard of over pressure.

 

[Youllneverguess]

A very sound response