In the bungalow we moved into last month there is an indirect cold water system, a Brink warm-air central heating system, and a HW tank fitted with 2 immersion heaters which supply all the property's hot water via a Stuart Turner 'Monsoon Standard 3.0 bar Twin' shower pump pumping both cold and hot water to their respective taps in bathrooms etc. (One of the bathrooms is in a 1st-floor extension).
All worked well for a month until we went away over Xmas, when we turned the master stopcock off under the kitchen sink. On our return yesterday it was a nasty shock to discover that the flow of water out of any HW tap soon dwindled to a trickle, then stopped. (Though if turned on soon afterwards the same sequence would occur.) The water *does* start getting hotter.
N.B. The 1st HW tap to be turned on coughed up some brownish water before changing to clear. No problem with any *cold* water tap. So am baffled because:
(1) As it happily pumps cold water the pump itself is presumably OK. (2) Why would turning the rising main stopcock off affect pumping from a tank supplying both cold & hot taps? Just a co-incidence?
(3) The pump was replaced* 4 months ago. What might the cause be of failure to pump to HW taps ?
(* Have emailed the company, it being Sunday today.)
In the meantime, it's cold washes all round.,.