Electric shower vs bath

BUFF

It depends upon what you use to heat/what temp if stored hot water is used. & in order to get a 40C bath using mixed cold you would need to heat hot to higher than 40C.
If you use a combi then it probably would all be heated ~40C rather than heated higher & mixed down (certainly in winter) or your flow rates would be really low for filling a bath.

shiraz99

BUFF said:

It depends upon what you use to heat/what temp if stored hot water is used. & in order to get a 40C bath using mixed cold you would need to heat hot to higher than 40C.
If you use a combi then it probably would all be heated ~40C rather than heated higher & mixed down (certainly in winter) or your flow rates would be really low.

It's a combi boiler.

BUFF

I have a combi (with a high flow rate for a combi). Through winter when I have a bath I only need the hot tap open, no cold mix.
I could heat to a higher temp with a lower flow rate & then mix down with cold but why?
The limiting factor is how much energy your boiler can add to the water so you can have a lower flow rate at higher temp. rise or higher flow at  lower temp rise - your choice.

shiraz99

I prefer to get the water hot and mix down with cold to get the perfect temp rather than use a lower temp/high flow because it's not always warm enough depending on the prevailing indoor temps. One of the reasons I've never gone for a thermostatic bath/shower mixer because they just don't get hot enough for a decent bath in the winter.

BUFF

Personal choice then.
A thermostatic bath/shower mixer should get hot enough in winter provided that:
a) you supply it with  hot enough temp. hot water to start with (my system loses quite a few C in pipes between boiler & bathroom outlets but I run the hw temp on the boiler hot enough to allow for that loss)
b) it is properly adjusted when installed.

the whole point is that it should adjust for temperature variations in incoming supplies to provide an even output.

ariarnia

shiraz99 said:

I prefer to get the water hot and mix down with cold to get the perfect temp rather than use a lower temp/high flow because it's not always warm enough depending on the prevailing indoor temps. One of the reasons I've never gone for a thermostatic bath/shower mixer because they just don't get hot enough for a decent bath in the winter.

our try was heating from 4-60c and heating around 120L for about 7.8kwh (from here https://www.diydata.com/planning/ch_design/hot_water.php) so probably a little to hot and a little to much water but that was about 80p (plus about 30p for the water at our rate of about £3 per cubic meter of water/waste on our bill)