"Adam Funk" wrote in message
...
On 2016-11-26, newshound wrote:

On 11/25/2016 6:32 PM, Tim Watts wrote:
On 25/11/16 18:20, Adam Funk wrote:
I need to fix a hot tap in a sink in a relative's house (either clean
out & replace the washer, or perhaps replace the tap) --- that's
fine. But there's no service valve for this tap, and she has a
combination boiler.

What's the correct procedure for turning off the flow of hot water
from the boiler in order to cut the pipe and put a service valve in?
Should there be a valve somewhere downstream of the boiler,

Unless there is a ballvalve isolator inline with the tap, there is no
standard valving - it's always house dependent.

or do I
turn off the main stopcock coming in?

Quite possibly.

Thanks.


Don't Combis normally have a tap on the DHW outlet? That said, turning
off the main at the inlet (or the stop tap) is all that is needed. It's
perfectly safe to leave the CH running with the mains stop tap turned
off.

Thanks, everybody. I do remember that her boiler has separate
controls for turning the CH & hot water on & off.

Er, are you talking about turning off the heating aspect of the boiler or
turning off the water supply? I thought you were talking about replacing a
tap washer, which mean tuning off the water supply to that tap (either by
closing a stop vale of by turning off the rising main). Turning off the hot
water control at the boiler would simply ensure the water to the tap was
cold rather than hot - it wouldn't turn off the water flow itself. Maybe
I've misunderstood your phrase "her boiler has separate controls for turning
the CH & hot water on & off" - maybe you are referring to a tap rather than
a control switch. Or maybe your system has motorised stop valves, which
*would* mean that when HW is turned off at the boiler controller, water flow
was turned off.