Dripping Kitchen tap.

[bluenun20]

I have a dripping Kitchen tap, I was able to shut off the mains water to replace the cold tap but
there is no isolating valve to the hot tap.
I live in a concrete floored bungalow and the pipe goes under the floor in the kitchen but I cannot see where it goes to,
I would have thought to the cylinder in the bathroom although I cannot see the pipe.
What would you do now in order to change the hot tap?

Thanks for any help.

 

[terryplumb]

If you have a hot water cylinder that is fed from a loft tank ,closing off the supply to the cylinder from loft tank will allow you to drain hot taps.

 

[bluenun20]

Thank-you.
So draining down the hot water is the way to go.
I had a look in the loft and there is a pipe coming from the bottom of the water tank in the loft to the bottom of the cylinder, see picture.
The red valve is completely stuck so would I need to prop up the ball valve in the tank to stop more water coming in and use all of the water in the tank and then change the tap?

 

[terryplumb]

You could ,but the entire contents of the hot water in the cylinder would be lost ,and replaced with the cold water from the loft tank.
You could fit a bung to the loft tanks outlet ,that will save all the water loss.

 

[bluenun20]

Thanks, great idea. I did not know they existed. Watched a couple if videos in the type to get.
You would think plumbers bungs would not be hard to find on either ebay, screwfix, b&q or toolstation but none of them have the continuous type.

 

[terryplumb]

Stick a cork in the outlet ,or a carrot,potato, trimmed to fit.

 

[bluenun20]

Thank-you.