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I am guessing you have one with an expansion vessel then rather than an internal air gap,

I would get your unvented cylinder serviced then, you may find the expansion vessel/air gap has gone and all the pressure is being stored in the pipework, once heated, there possibly could be up to 6 bar held in the pipework, before the expansion relief starts discharging to relieve the...

I use this one easy to use http://buyplumbingonline.co.uk/products/Salus-RT500RF--programmable-wireless-room-thermostat.html

Just the same, it all depends on how often you have the immersion heaters on for, The pulsacoil and the 2 mentioned both have 2x 3kw heaters, if anything the 2 mentioned have more insulation to retain the heat.

I fitted one of these recently and was very impressed http://www.advanceappliances.co.uk/electric_thermal_store.html also not a bad price :wink: Or another option would be the http://www.telford-group.com/Products/thermalstorenew.asp

Is it on a combi boiler or unvented cylinder, if so consider fitting a pressure reducer at the main stop tap and get your whole house as a balanced supply, bit easier than repairing all showers or fitting non returns everywhere

When you removed the "O" ring in the body did you scratch the body at all? easily done, I use a dentists tooth pick to remove the O ring If so I think you may have knackered the body, if not contact Aqualisa if you bought the cartridge from a reputable firm, shower doctor, shower services...

I agree with Eaton, it sounds like it is connected up wrong and I think the engineer manually opened the motorised valve, so the system would heat up. Has the cylinder had the element connected? if so this may be a easier way to get hot water until you get your wiring looked at