>> ...without draining the system. Our 1930s house has a spare bedroom, with a washbasin connected
>> to the hot water tank via lead pipes. Its washers need changing as I fear
>> they will leak before long. A plumber tells me that a pipe-freezer cannot be used
>> on lead.
Remedy
If you can't/don't want to turn the system off. Normally you won't be affecting the central heating system as it will be on a different circuit. Most unusual not to be.
Get everything ready. What are you doing first? Hot tap, or cold tap? Turn on other taps, hot or cold as the case may be, let them run, having made sure that the plugs are not in.
Turn your tap on. Whip the stem of the tap off on the basin you are doing, there shouldn't be much water come out as all the other taps on the circuit are running. Quickly change the washer, replace the tap stem, turn the tap off. Turn other taps off that you turned on. Job jobbed. Repeat for the other tap, if necessary.
Note. Have a good rummage under the kitchen sink and in the airing cupboard, I would be surprised if you didn't find a valve that would turn off the hot/cold to the basin (it was a basin, wasn't it?) that you wish to work on.
I hope that all makes sense. You've got my number, haven't you?
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