I live in a modestly sized 70's detached house with a gravity fed hot water system. When we had our kitchen face-lifted a couple of years ago I installed a contemporary mixer tap which I did not realise at the time was only suitable for HP hot water systems - as a result the hot water flow is very poor from that tap.
I am about to strip out my bathroom and want to install a very contemporary bathroom and, of course, want to finish the job off with very contemporary taps. The problem is, of course, that with the cold water storage tank being just about 1 metre above the basin taps, the water pressure at those taps will be around 0.1 bar and very few contemporary taps are suitable for pressure that low. I would also like to get rid of my existing electric 'power shower' and replace that with a simple contemporary mixer unit. Clearly I cannot do that with hot water pressure at 0.1 bar.
So - what's the solution? I understand that I have three options:
- Switch to a combi boiler.
- Install a shower pump (which I would like to pressurise the entire house hot water system).
- Install a mains-fed pressurised hot water cylinder.
I'm not too keen on a combi because it seems that almost every one I know who has a combi has problems with it - not just with regular reliability problems, but also with hot water flow problems. My existing conventional boiler is now over 30 years old and has only ever required a thermocouple replacement! The other problem with a combi is that my boiler is situated inside our attached garage and I'm concerned that it may take a long while for hot water to reach the taps from that isolated location.
A shower pump pressurising the entire house would probably be the cheapest option - but I understand that they can be very noisy - and because they operate on a pressure-switch principle, will regularly 'cycle' in order to re-build pressure in the system and this can be annoying - particularly during the night.
The final option is to replace the standard hot water cylinder with a mains-fed cylinder which would (it appears) resolve my hot water pressure problems with very few drawbacks.
I would be interested in knowledgeable opinions on these three options and also advice on whether a mains fed cylinder could be installed in the loft thus allowing me to enlarge bathroom space by removing the airing cupboard and giving me space to install a walk-in shower.
Cheers!
Kev