Primary Circuit Backflow in Solid Fuel / Oil Fired system

[Solid Fuel]

Stat on pipe just before hot water tank, got non return after both pumps.
Circuit is working perfect other then this glitch which I would like to sort.
Tks for reply's

 

[Best]

There is nothing you can do with this, as far as I know, as the primary flow in a bungalow, rises above the cylinder. This will always allow the heat to travel back to fire overhead. A flap door type check valve fitted on the primary return between cylinder & fire feed pipe will stop this & still leave open vent & feed if something happened valve. But I repeat, I think this is not allowed.

 

[Solid Fuel]

Hi
Yes the principle is not to have any mechanical restriction in the primary circuit for obvious reason but I was wondering has or is there any other method i.e. construction of pipe bends to create air break or dead leg but still not interfering with the natural flow when required. Basically any tricks !!

 

[Best]

Bar, putting the cylinder in the roofspace, in a bungalow, which would mean the hot water wouldn't go downwards, then I see no way of stopping it. It is the flow that is the problem & this can't be fitted any other way than it should. Once the heat starts to rise up the pipe in hot press, the return replaces it, thus starting a circulation. So nothing you can do with bending pipes different ways.

 

[ecowarm]

It would be better if it had a neutral point i.e neutralizer or link up system. But as it is now flow and return should rise to cylinder not drop down like the return and also I would also have the flow rising all the way to cylinder connection. But as said it would be better with a neutral point or have a look at the H2 Panel.

 

[Solid Fuel]

Hi
I have seen products like this and went for the basic set-up at present (cost been a factor) and opted to, if you like to suck it and see in relation to dropping back down from the roof space to my hot tank, flying in the face of the constant rise to the cylinder given the current house configuration. That said the flow and return path I am very happy with, as tested with full fire from cold on windy day it heats and moves water fine around the circuit.
I think for present so far it looks like I will have to conceded to the backflow unless another simple option appears on the horizon.
Tks for reply.

 

[Gray0689]

You really only have one option that's a flap non return valve if you don't put it on your hot water will not last long at all

 

[ecowarm]

I suppose you could put a normally open 2 port valve on the return operated by a stat on the flow so if no heat in solid fuel boiler valve shut and in a power cut valve returns to open. Please check regulations as to wether this is allowed

 

[Solid Fuel]

Thinking that but will this affect my flow much. Have you fitted these with good affect.

P

 

[ecowarm]

Fairly full bore, slight restriction, not much though