On 31/03/2021 16:56, Martin Brown wrote:
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?

The ones in our VH are 25L capacity 3kW so best off hardwired in. They
are fine so long as you don't turn the tap on and leave it running until
it gets hot. There is only 25L of hot water available and when it is
gone it takes a while to heat back up again.

Things to watch are you will need an overflow/vent outlet

I am sure that I have seen some that don't have to have overflows or
vents. They work by allowing expansion due to heating to push back into
the inlet pipe - the limited volume of expansion not being in any danger
of pushing warm water back into any other leg.