21 Meter Pipe Run - What Size Pipe

[Barnman]

I am running pipes from a biomass boiler to the house for hot water and central heating. I have had several different plumbers say different things about the size of pipe - 28mm or 35mm etc. What size should I use?

 

[ChrisR]

Start with kW loading.
Is it for radiators,/ undefloor/ constant temperature circuits/... ?

 

[Barnman]

It is for radiators and underfloor heating and hot water.

 

[Norcon]

What biomass boiler did you go with in the end? Make and model etc.
What KW output is it rated for?

 

[Agile]

It might be more economical to split the pipe into two 22 mm rather than a single larger pipe.

You will need insulation and to keep vermin away!

Does anyone know the max temp rating of blue polythene water supply pipe as thats quite cheap?

Tony

 

[ALEC1]

uponoor make a fit for purpose preinsulatec pipe for burying underground...

I doubt that the OP ison a tight budget...not everyone wants cheap....

 

[Agile]

I seem to remember that insulation, good as it is, is about £6-£10 per meter!

But those who buy biomass boilers are rarely interested in the capital costs.