On 31/03/2021 16:17, Mike Halmarack wrote:
I'm seeking some advice on choice of electric, undersink boiler.
I only have a need for hot water, Maybe 4 washing up bowls a day, 8
washhand basins full per day ( unless the water from the boiler is
drinkable and then 8 kettles full per day too).
Can anyone recommend a small undersink boiler that will be suitable
for this?
Also, would the smaller type of electric boilers have a plug-in rather
than a hard wired option?

If fitted to a cold water supply you will need a non-return valve,
pressure relief valve and an expansion vessel (though a length of pipe
is allowed for some heaters in lieu of an expansion vessel).

As I had a water supply from a hot water tank it meant I didn't need any
of these protection devices.

At the time my hot water tank was badly lagged and heated by electric
only and I had a shower, so I only turned the immersion on if necessary.