Have you done this? Instant warm / hot water at sinks (not boiling taps)

[Great_scot_selfbuild]

I’m looking at an options of installing an instant water heater at the sink taps at the end of long runs. I have had more than one person suggest such an idea to me and I’m trying to understand the options out there.

 

I’m not talking about instant boiling taps, but rather running only cold supply to the sinks, with an instant water heater at the sink to heat it at the point of use.

 

Willis heater https://www.unventedcomponentseurope.com/willis-jacket-external-immersion-heater-complete-pre-wired-and-fully-assembled.html/

Stiebel Eltron Instant water heater https://www.stiebel-eltron.co.uk/en/products-solutions/Hotwater/instantaneous_waterheater.html

We only have single phase, so are looking at the smallest options

 

Has anyone done this, and what does the cost to the electricity bill look like? Noticeable?

[Russdl]

There is a fair bit on the forum going back a good while regarding instant water heaters, I don’t know if you’ve searched yet but something there may answer your question.
 

I have an instant water heater in the garage, puny little thing but produces nice tepid water at the end of a 20m cold run. 

As for the Willis heater option, that won’t automatically switch on when you run the tap so I’d suggest it would not be a straight forward solution for your problem (great for UFH though!)

Edited 7 hours ago by Russdl

[MikeSharp01]

6 hours ago, Great_scot_selfbuild said:

Stiebel Eltron Instant water heater

@Jeremy Harris played with those although I think he just used them to boost the hot water at the end of the HW run. I dimly recall he gave it his best shot but in the end removed them as they didn't meet his need.  

[ProDave]

3 hours ago, MikeSharp01 said:

@Jeremy Harris played with those although I think he just used them to boost the hot water at the end of the HW run. I dimly recall he gave it his best shot but in the end removed them as they didn't meet his need.  

I have Jeremy's old Stiebel Eltron 10kW instant water heater.  It is on the hot feed out from the UVC to the bathroom pipework.  It was fitted as a comfort blanket when only heating hot water in the tank to a low temperature, so a given size tank would not deliver as much as most people would be used to as dilution with cold would be a lot less.  The theory was if you used up all the hot water part way through a shower you could carry on using it just like a 10kW electric shower.

 

It is still there but I suspect it never turns on.