The first question my wife asked in the aftermath of the awful gas explosion earlier was "Have we got a GD in the house?"
We live in an old 2-up-2-down terrace. In the (extended) kitchen, there's a Baxi combi boiler, installed 12 years ago to provide GCH.
The (Town) gas supply was routed thru the loft. A quick google shows that town gas (rotten eggs) is lighter than air. In my case I will need a GD near the kitchen ceiling and another one, high in the loft. Fitting a mains one in the kitchen is fine but problem is, I have no electrics in the loft and the one's I've spotted on an Ebay search, all need mains power :-
Most of these are the portable one's use by Gas Board bods. Ideally I would like one that you could permanently hang on the wall, similar to the smoke alarms and powered by a 9v battery. I have lots of re-chargeable 9 volters'. TIA