Defro Duo Uni 35kW Boiler: Choosing Inflow Pipe Diameter for 6-8 Circuit Manifolds in 240m² Home

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#31 10392905 13 Jan 2012 21:25

Snoopy429 Snoopy429

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Post #31
10392905 13 Jan 2012 21:25

I will ask the question.

If I have a copper riser with a diameter of 22 mm, is it enough for 6 600x1400 v22 heaters?
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#32 10408537 17 Jan 2012 09:04

kabee84 kabee84

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Post #32
10408537 17 Jan 2012 09:04

Snoopy429 wrote:
I will ask the question.

If I have a copper riser with a diameter of 22 mm, is it enough for 6 600x1400 v22 heaters?

Yes.
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#33 10568715 19 Feb 2012 18:32

Anonymous Anonymous

Anonymous

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Post #33
10568715 19 Feb 2012 18:32

What do you think about 32mm pex per riser? (Actually, I mean the distributors)

Added after 7 [minutes]:

And maybe a question for someone who has experience: how many watt per meter ^ 2 3-layer walls made of limestone blocks, 10cm polystyrene, 10cm polystyrene floor. Is 100W enough, there is probably an increase, but it should be ok, I will add that there are large windows.
#34 14383832 30 Jan 2015 16:09

brzeszczot1987 brzeszczot1987

Level 1

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Post #34
14383832 30 Jan 2015 16:09

Hello, I make central heating + hot water installations, the entire installation is about 15kw and now I have a small problem what diameter of the pipe to choose when reaching the manifolds from the furnace or 25 mm pp pipe is enough or better to give 32mm some ideas I thought to leave the furnace 1 1/2 "graphite protection 11/2 "and to one 25mm manifold and also 25mm separately to the other, both manifolds will support about 6 kw
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Topic summary

The discussion revolves around selecting the appropriate inflow pipe diameter for a central heating system using a Defro Duo Uni 35kW boiler in a 240m² one-story home with 6-8 radiator circuits. Participants suggest that 16-20mm PEX pipes are generally sufficient for connecting radiators to manifolds, while larger diameters (25-28mm) may be necessary for the main supply lines to accommodate the total heating load. The total power requirement for the radiators is calculated to be approximately 30,189W, necessitating careful consideration of pipe sizes to ensure adequate flow rates. The use of copper pipes is recommended for connections to the boiler, and the installation of temperature sensors and expansion vessels is discussed. Various schematic diagrams are shared for clarity, and the importance of proper pump selection and configuration is emphasized.
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