Thanks for your comments however due to space restrictions vented is not a viable option, I have enough space to fit an additional boiler and replace the tank if need be, other than that I,m stuck with it.
I,m quiet happy to work in both KW and BTU's however I,ll take your comments on board and work with only one for clarity.
Some others may have a view on using 4 x 47 kG LPG cylinders because of the extraction rate when its cold and I think that Forfar is one of the colder areas there.
As well as the problem of how often you will need to replace them.
In the warmer UK I bought an LPG boiler from someone who had just given up using 47 kg cylinders and needed about one a week. In cold weather you might need two a week!
Whatever you do be careful as there are many pitfalls.
Solar panels don't have to be on the roof if you are not in a vandal/theft area.
A friend in London had 18 PV panels stolen soon after installation and before he moved in. The scaffolding was still up to make it an easy theft! He has close neighbours either side too.
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