Thanks Lee, and in reply to others who have also provided help & advice on this... yes I did say it would likely cost more to run but he said gas is costing £280 / month on DD and it can't be more than that. House is 3 bed plus a flat built from old garage but got convectors in there ( very small flat ) house is semi detached prob 5-6 rads in whole house, old range foam cylinder approx 150 ltr immersion element heated only from a timeswitch.
£280 per month for a three bed semi ?
Really?
Gas only?
Somethings wrong in my opinion!
even if he had it on 24/7 i'd expect less than £3360 a year
I hope that's not a gas leak!
I've seen em that big!