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turn off hot water supply?

We want to install a new kitchen tap. Cold water can be turned off at stopcock no problem. We have indirect supply with cold water tank in loft, immersion heater in cupboard, with 2 red handles, one which is hot and will turn off and the other which we think is the cold supply is stuck. Do we just turn off the stopcock and empty the tank upstairs as there is no other turn off from this tank. We are concerned that we could have problems with air locks after completing the job. Any advice would be much appreciated.

Lancashire lad
March 2011
D.I.Y, PlumbingTurn Water Cold
one of the valves should be bigger than the other this is the h/water gate valve the other is the c/heating supply either way normally you don't get very many problems if you have to drain header tank (make sure boiler is off otherwise as water in cylinder gets hot it expands and will trickle into downstairs hot pipe)

brian
March 2011

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Turn Off Hot Water for Tap Install - Advice