I bought a pump to boost the pressure to our hot water, mainly because the
missus wants a mixer tap on the bath, and we haven't got enough head to feed
it properly. My original thought was to have it near the hot cylinder near
the floor somewhere, with a non-return valve on the expansion pipe, but I'm
not sure if I have enough space to get the pipe cutter in. I thought it
might also go in the loft on the outlet of the cold water tank, but I'm not
sure if this is sensible, given that there is now going to be a hot water
tank in between the pump and the taps (and they might make it less
reactive); plus, it gets very cold up there in winter (maybe even freezing).
Would putting it in the loft be workable? You'll have guessed by now that I
would prefer to avoid cutting a hole in the cylinder, and feeding it from
that. But I will do, if it's absolutely necessary.

"Ivan Dobsky" wrote in message
...
I bought a pump to boost the pressure to our hot water, mainly because the
missus wants a mixer tap on the bath, and we haven't got enough head to
feed it properly. My original thought was to have it near the hot cylinder
near the floor somewhere, with a non-return valve on the expansion pipe,
but I'm not sure if I have enough space to get the pipe cutter in. I
thought it might also go in the loft on the outlet of the cold water tank,
but I'm not sure if this is sensible, given that there is now going to be a
hot water tank in between the pump and the taps (and they might make it
less reactive); plus, it gets very cold up there in winter (maybe even
freezing). Would putting it in the loft be workable? You'll have guessed by
now that I would prefer to avoid cutting a hole in the cylinder, and
feeding it from that. But I will do, if it's absolutely necessary.

Oh, hang on... If it's in the loft, what's to stop it just pumping water
through the expansion pipe all day?

"Ivan Dobsky" wrote:


Oh, hang on... If it's in the loft, what's to stop it just pumping water
through the expansion pipe all day?

Nothing. That's why you don't try pumping *into* a vented tank.

Tim

Tim+ wrote:
"Ivan Dobsky" wrote:


Oh, hang on... If it's in the loft, what's to stop it just pumping water
through the expansion pipe all day?

Nothing. That's why you don't try pumping *into* a vented tank.

Tim

Don't forget for your mixer to work properly, you need equal pressure on
the cold feed too.
If your "mixer" is not a real mixer but is just two taps leading to a
single spout with insufficient opening to suit your gravity feed DHW,
then get a mixer that is designed for your sort of plumbing.
Fitting a pump is just a bodge.