Back in the late 1960s there was a company, Servowarm (not related to the current central heating company of the same name) which used to sell gas central heating systems which consisted of a Master Radiator - which had a built in gas boiler, plus pipework to other radiators. They advertised in the south London area at least. My late aunt had such a system installed which, hence the reason for this post, included a very small balance flue gas boiler fitted in the airing cupboard which was coupled to the existing hot water tank (I say tank because it was a rectangular galvanised steel tank rather than a copper cylinder. It had a 'manhole' access lid on the front). It was a gravity system there was no pump and no connection to the Master Radiator downstairs.
Question is, are such similar water heaters still available? It was certainly small, there was not that much space in the airing cupboard and if my memory is correct it was fitted below the shelves above the tank.
Clive
