On 04/05/2019 19:04, Tim+ wrote:
ARW wrote:
On 04/05/2019 16:56, Jim K.. wrote:
Looking into fitting one of these at the far end of the house
where the run from hot water tank is excessive.
Found a 3kw one that looks ok.
It will be underpowered for the duty. 5-6kW will work OK.
Plumbing shouldn't be a problem.
Elecs - thinking 13a plugs are nono, so a spur to a FCU from a
nearby socket should do? Double pole switch?
Electrically, what do I need to check (& how) before proceeding?
Perhaps make sure the socket I would be spurring from is on a
circuit protected by a 32A breaker?
RCD "required"?
Er... Any other pointers please?
Just the one.
A undersink water heater is a lot better
eg
https://www.screwfix.com/p/3kw-15ltr/2371g
depending on your intended use.
Hmm, we have a long run from our unvented cylinder to our kitchen sink.
Theoretically, could one of these be plumbed to the hot supply, and if so,
what would €śstandby€ť annual running costs be like?
In the ballpark of 30-50W per unit continuous 24/7. We had this problem
in our VH when people left them on regularly (and there were several).
You could obviously cut this by 1/3 by using a timed switch. The water
stays reasonably hot overnight but it also warms the cupboard it is in.
The most annoying one being in the downstairs kitchen where people would
turn on the tap to "run warm" exhaust all the 15L of hot water to waste
and then complain that it was running cold. It was about 3m from the
mains supply and flash boiler would have been so much easier all round.
I dont mind paying a bit for more instant hot water in the kitchen, but
not if the insulation is poor and its gonna cost a lot to keep it warm.
(Having said that, it would be easy enough to reduce losses by putting it
on a time switch to run for 8 - 12 hours a day say).
It might be viable but you would also need to check that your cold
supply water pressure was within limits or add a non-return valve,
pressure adjuster and failure/overflow vent. In a place where instant
hot water is important and usage is intermittent they are OK but if a
decent high power supply is available I would go for a 6kW flash boiler.
(but not in a hard water area)
--
Regards,
Martin Brown