On Thu, 01 Apr 2021 09:36:10 +0100, T i m wrote:

On Thu, 01 Apr 2021 08:53:30 +0100, Mike Halmarack
wrote:

On Wed, 31 Mar 2021 20:51:40 +0100, GB
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?
Also, would the smaller type of electric boilers have a plug-in rather
than a hard wired option?



Mike

How much water do you need for a washing up bowl? 5 litres, 10 litres?

A 3kw instantaneous water heater only delivers around 1 litre of hand
hot water per minute. So, it will take you 5-10 minutes to fill the
washing up bowl. Are you okay with that?

That's for water coming in at 5C, and washing up water at 50C.

If that be so, an irksome non-solution.

I think it may depend on what the (worst case) goal of the solution
needs to cover?

If it includes actually *needing* a bowl full of washing-up
temperature water several times a day than anything 'instant' is going
to have to be pretty powerful, as is any local water store, if not
either quite high capacity or high power (for reasonable recovery
time).

I've no idea how powerful our balanced flu combi-boiler-sized
multipoint water heater is but even that would take quite a time to
fill a basin with hot water (mainly the time taken to get the hot
water to the basin) and a fair time to fill even a corner bath, as
does the combi boiler in daughters flat (where you start the bath
running then go and do something else for a good time).

When having baths at Mums years ago with a big HW cylinder you could
run a bath pretty quickly (all be it only one without waiting ages).

And if you were suggesting filling a kettle with hot water from any
such hot water source, I'm not sure what advantage that would be other
than saving time?

There isn't anything much more efficient than a kettle (the element in
direct contact with what it's heating in a reasonably insulated
(plastic?) container) and so likely more efficient than heating and
storing the water to use later or from an instant heater (unless gas
because of the potentially cheaper energy costs).

If you are talking of washing crockery, depending on how much and how
heavy the soiling (baked on stuff that might appreciate being soaked),
I wonder if Jeff could test / vouch for how practical it might be to
wash a plate under the instant hand washer?

Cheers, T i m

Thanks Tim, very informative. Youve certainly added to our list of
needed considerations.
I like the "back to simplicity" kettle idea.
--

Mike