Turning off hot water

[eve123]

We want to change the sink in the bathroom. We have turned off the water supply at the stopcock and also at the combi boiler the cold water shuts off but the hot water tap still runs but cold. We have isolated and taken off a radiator in the bathroom but don't know if this would affect it, any help greatly recieved

 

[jonnyswamp]

If you have a combi and you've isolated the cold going to it, the hot tap should also run dry
Have you got another bathroom upstairs, if so open the hot and cold taps there and the water should stop after the pipe work has drained
Is your boiler run off mians cold water or tank fed

 

[c.gas]

taking the radiator off won't effect hot water as that's a different pipework system. If you've isolated the cold water inlet at the boiler and you still have water coming out the hot tap then it's possible that water is still passing the inlet valve. Would also mean it's passing at the stopcock aswel if you've isolated that. You would be very unfortunate if both was passing tho, not experienced that before. Sure it's the water inlet at the boiler that you've isolated?

 

[c.gas]

take a pic of what you have isolated at the boiler and post it

 

[itcanbesoeasy]

The only thing I can think of is the cold is still tank fed to the bath and wc cistern but the basin is mains fed,common practice years ago so you had drinking water at the basin and the hot is back circulating if there is mixer taps on the bath.

 

[eve123]

The combi boiler is mains water fed the hot water never runs dry. We cannot shut of the water downstairs other than the isolater red and blue taps under the sink. This does nothing to the water supply upstairs

 

[eve123]

No mixer tap on bath its 2 taps with a shower attachment

 

[eve123]

 

[eve123]

 

[eve123]

There is no water tank , there is an old water tank in the loft but it is empty. The house was registered on 1st Jan 1930.

 

[eve123]

^^^

 

[Scott_D]

Thats the filling loop, its for topping up the pressure in the heating system and should be off.
The valve for the hot will be under the boiler

 

[eve123]

( We did think that but cannot see any other valve) this is under the boiler , where would we find the hot water valve? Thanks

 

[Scott_D]

Touching the underside of the boiler, all the brass valves are in a line. Its not uncommon for them to leak after they have been played with though. Would be best to find the main stop tap for the house, even if its for future reference
There may be a white plastic tray to remove to see the valves

 

[eve123]

Bingo! found them ... is it safe for us to turn these off or do we need to get gas engineer in? Thanks

 

[Scott_D]

You can turn off the valves but you cant take the case off the boiler

 

[itcanbesoeasy]

you don't need to turn off the gas valve or the two 22mm valves (heating), just the 15mm cold feed

 

[Gary80gas]

It can be useful to get a full bore 1/4 turn valve on the incoming mains. Easy to know when its on or off. Turn it off, open taps and all should run dry ready for alterations.

 

[Leezygeezer]

Cold water feed is usually the 4th pipe from the left, although the picture is a little shaky, it appears there is a black isolation valve, usually a 1/4 turn so the valve is at 90 degrees to the pipe means it is off.
As advised though, turning off the cold mains supply is a better option, most of these types of valves are notorious for leaking when operated.