DIY Doctor

Plugging a free flowing hot pipe on old water system

Postby B0M0A0K » Sat Aug 22, 2020 3:57 pm

I am preparing to change the sink unit in my kitchen and have just discovered that there are no cutoff valves on the hot and cold pipes that feed the sink. I would prefer to fit these before I go any further but this is an old house and I have never really understood the way the water system works. This is an old back boiler installation and it looks like I would need to completely empty the hot water tank before cutting the hot pipe to fit the cut off valve. If I can't figure out how to do this then it will be a free flowing hot water supply while I am trying to fit the cut off valve. That's alot of water!

Is there anything anyone can recommend that would let me isolate the supply while I complete this work without draining the entire hot water tank? I guess the "freeze" solution is out of the question because it was constantly melt due to the hot water.

Any suggestions please?
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Simply Build It

Postby stoneyboy » Sun Aug 23, 2020 10:13 pm

Hi b0m0a0k
Assuming you have a cold water tank you just need to plug the pipe which feeds the hot water cylinder or you can tie up the ball valve, empty the tank use a cold tap, then turn on a hot tap to drain the remaining water. Your hot cylinder will remain full.
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