Hello, I'd like to have a largish heat store that can be used with a wood burner in the winter and solar in the summer. It will also need a gas boiler. I understand that I will need a 'system' boiler, but not sure what boilers to be looking at. Does anybody have any recommendations for a suitable gas boiler that would be robust and good value for money?

Hi COP I did ask whether anyone was available locally to assist you on the other gas engineer forums but no-one has volunteered just yet I am afraid.

We fit a lot of Intergas boilers and have been very happy with them, they can be used on open vent or sealed systems, but I would strongly suggest that you look at sealed stoves to improve the quality of the installation, or seal everything bar the stove circuit.

We have just installed an Intergas with a sealed stove with both feeding a 300 litre buffer, a flue stat relays out the boiler when the stove is in. 1 rad circuit is weather compensated via an LK130 valve and the towel warmers are on a fixed temp circuit on a timer, hot water is via the combi side of the boiler.

A sealed stove also doesn't have to have a gravity circuit which can be a pain to install and wasteful of energy.

The achilles heel of the Intergas is the lack of modulation (comparatively), but as you will be using a thermal store this will not be an issue, if you design the rads with a max FT of circa 65 the boiler will condense nicely into the store. In the installation above a buffer stat linked in series with an external stat calls on the IG boiler when required.

I have our schematic but not sure how to upload it.

If the schematic is a picture, it should just upload using the choose file button below the comment box. If a PDF, doc or other non image might have to rename it to add .txt to the name (e.g schematic.pdf -> schematic.pdf.txt, COP then d/l and removes txt extension to view)

Could also screenshot it using SNIPPING tool And upload as images (PNG format advised) using button below

Good point.. Forgot that some things are hidden if a user uses the "enter username , password and message to post" mode of forum behaviour

Here's Jon's schematic.