blanking off feed and return

[Selfbuilder3]

Hello.

I have been adviced to fit a thermal store.
Looking into the details I have to agree it's a good idea.

I intend to fit a solar system, log burn stove with back boilder and ASHP.

Just the log stove has 4 back boiler connections (two for feed and return of the hot water and two for the feed and return for the radiators/underfloor loops).

If i use a thermal store i can only use one set of the feed and return connections and blank the other two off.

Is this common practice ?.

Also will the thermal store get the full Kw output of the stove ?.

The intended stove is a Dunsley Highlander 16 has a max output of 8.5Kw to water if burning wood.

But if i block off two of the feed and return pipes will the thermal store get the full 8.5 Kw?.

Thanks,
DJ

 

[Pipes Plumbing]

Make sure that your installer is HETAS registered, they will be able to advise on this accurately and safely so you get the safest and most efficient system possible.
Remember that these installs will be notifiable works, so Building Control will need to certify (or a HETAS engineer can self certify it on your behalf for a significant saving).

So long as the 4 tappings are into the same back boiler and not a pair of twins (99.9% of the time it's a single), then you should be fine and get the full output.
You can normally cross connect across the tappings so that flow comes from one of the top tappings and return from the opposite side lower tapping.
Ensure that whatever is done is in line with the M.Is and building regs.
Safety is number one with these, and all the additional sfety fallbacks need to be in place and fitted correctly (Temp relief, gravity circuit with heat leak etc etc...)

 

[SimonG]

Are you using the soilid fuel to heat the thermal store direct or using a coil into the thermal store?

 

[Selfbuilder3]

Are you using the soilid fuel to heat the thermal store direct or using a coil into the thermal store?

its a coil.


if it was not a coil (direct into the tank) would it make any difference?l

 

[SimonG]

I was just thinking about cold feed and open vent for the solid fuel side.

 

[AWheating]

make sure the cylinder has a specific soild fuel coil, high recovery coils are not suitable for gravity systems. you will need a heat leak radiator.

the cylinder manufacture and stove manufacture will give you information to help you size the boiler amd cylinder, it needs to be sized correctly to avoid dampening and poor efficiency.

if you fit it yourself building control will most likely get a hetas engineer to check its correct before sign off so make sure its all correct to avoid extra cost of building control revisits.

 

[stevetheplumber]

if its to a coil the other two tappings will be for cold feed and vent although depending on design and mi's they could be from pipework