Would My System Work

[deanalewis]

Hi Folks,

I have had several Oil to Gas Conversion Engineers out and I have finally chosen one.

I have been suggested a combi because the man took a look at the main flow and return and said it should be ok.

I have decided to double check and it appears after the first few meters my Flow and return pipes go down to 15 mm for the rest of the system

2 Rads Are Provided by 28mm pipe
1 Rad By 15 mm Pipe From Plastic Manifold
1 Cylinder By 15 mm Pipe Sharing with above radiator.

Plastic Pipe to Right Hand Bend then back to copper for down stairs

12 Rads Down stairs All 15mm Visible

Unfortunately these are burried under concrete so I am unable to see them however the pipes are covered in an insulator brown sleve.

Can someone tell me if my system is suitable for a Combi or should I just give up now?

I was really looking forward to moving to Gas from oil but now I am kind of worried that my heating system wont support it? Or is there an alternative.

I was hoping to have the Gas boiler installed in the Cupboard where the Cylinder was.

Could my system operate on 15mm? For everything?

Cheers,

Dean



Diagram of What I know

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• deanalewis
• 12 Mar 2014
• 1

Manifold

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• deanalewis
• 12 Mar 2014
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Plastic Back to Manifold

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• deanalewis
• 12 Mar 2014
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Copper to floors below.

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• deanalewis
• 12 Mar 2014
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[Dan Robinson]

My rule of thumb is no more than 3 rads or 6kW off 15mm otherwise it is a barsteward to get balanced and working.

 

[deanalewis]

How come my current oil boiler has few problems with this, I would have thought a Worcester Bosch 29Cdi would eat this scenario for breakfast?

Whats the trade off's I've just started re-decorating the house and unfortunately the 15 mm pipes are all down stairs below concrete.

 

[ianmcd]

If your existing boiler is running ok with this system then no reason why your replacement gas one wont, that fact that you are replacing a system boiler with a combi wont affect the flow in your central heating in any way

 

[deanalewis]

Hey Folks,

This is my current system from what I can make out down stairs.

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• deanalewis
• 13 Mar 2014
• 1

If I upgraded it to 22 Mill Pipe on the existing run to the ground floor and included 1 radiator and a T that then supplies supplies 3 additional radiators.

Would this help heating and flow

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• deanalewis
• 13 Mar 2014
• 1

Or would doing the first idea and also running an additional 22mm set of pipes which are split from up stairs to enter at another point. Is this also lighten the load.

Down stairs I have 9 Radiators however 3 are chained on when I got an extension built. So I am thinking of having a 22mm Pipe run to 1 Radiator and allow the Branches to come off a 22mm pipe rather than the 15mm pipe that is presently there.

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• deanalewis
• 13 Mar 2014
• 1