28mm or 22mm? | Plumbing Jobs | The Job-board | Plumbers Forums

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Discuss 28mm or 22mm? in the Plumbing Jobs | The Job-board area at Plumbers Forums

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martinp262

Hi All - can anyone give me some advice re pipe sizing....

I am in the process of relocating my Trianco oil boiler from one side of the house to the other. In doing so it will now be approx 10m from the house. I have created a duct and had assumed that 28mm plastic pipe would be best for this run to the house.

My set up is currently Y-Plan but I am taking this opportunity to redesign the layout to be Honeywell S-Plan Plus; details are as follows:

Summary
15 Radiators (50,000 BTU/h with approx 60 litres Water Content)
33 litres Pipe Content (22m main runs with 15mm distribution)
30 Litres Boiler Content
Total Water approx 123 litres

Boiler Trianco External Eurostar
Heat output: Up to 115,000 Btu/hr (however it has a reduced nozzle size so not sure what Btu this is now?)

Honeywell S-Plan Plus Design
3 x 22mm 2-Port Honeywell (2 x CH Zones, 1 x DHW)
Grundfos Alpha 2 15/60

Expansion Vessel = 18 litres

I think that adding 2 x 10m @ 28mm flow/Return from boiler to house would add another 12 litres

Based on all of this will I be creating an efficient or inefficent system? Would it be better with 22mm?

I have already installed the 28mm pipe - so cost is not the issue just want it to be designed and operate efficiently!

Any advice greatly received - thanks, M
 
Hi All - can anyone give me some advice re pipe sizing....

I am in the process of relocating my Trianco oil boiler from one side of the house to the other. In doing so it will now be approx 10m from the house. I have created a duct and had assumed that 28mm plastic pipe would be best for this run to the house.

My set up is currently Y-Plan but I am taking this opportunity to redesign the layout to be Honeywell S-Plan Plus; details are as follows:

Summary
15 Radiators (50,000 BTU/h with approx 60 litres Water Content)
33 litres Pipe Content (22m main runs with 15mm distribution)
30 Litres Boiler Content
Total Water approx 123 litres

Boiler Trianco External Eurostar
Heat output: Up to 115,000 Btu/hr (however it has a reduced nozzle size so not sure what Btu this is now?)

Honeywell S-Plan Plus Design
3 x 22mm 2-Port Honeywell (2 x CH Zones, 1 x DHW)
Grundfos Alpha 2 15/60

Expansion Vessel = 18 litres

I think that adding 2 x 10m @ 28mm flow/Return from boiler to house would add another 12 litres

Based on all of this will I be creating an efficient or inefficent system? Would it be better with 22mm?

I have already installed the 28mm pipe - so cost is not the issue just want it to be designed and operate efficiently!

Any advice greatly received - thanks, M

definatley 28 mm my rule of thumb is 22mm up to 55000btus so im asuming youve got a cylinder in there somewhere to add to the 500000 heating load
 
Yes standard cylinder for DHW - how many Btu do allow for that?
 
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