Scalding hot water!!

[Leeccc]

Hi there, I've just moved into a new home, prior to this the previous owner installed a new boiler a "baxi ecolbue 16kw heat only". My previous home had a nice easy to use valiant combi which was simple to use, with my new set up having a water tank, pump and timer i'm struggling to keep the temperature down. Ive reduced it at the boiler itself from 70 down to 40 yet it is still coming out way to hot for me and everyone else in the house. Is there anything else i can do to get the water temp down, as its starting to p**s me off now! i much prefer my old valiant!.
thank you for your time.

 

[SimonG]

Could be a fault with boiler, cylinder stat.

Needs looking at.

Nice problem to have though when normally people have no hot water.

Any chance you have a thermometer and can take a reading?

 

[townfanjon]

Hi there, I've just moved into a new home, prior to this the previous owner installed a new boiler a "baxi ecolbue 16kw heat only". My previous home had a nice easy to use valiant combi which was simple to use, with my new set up having a water tank, pump and timer i'm struggling to keep the temperature down. Ive reduced it at the boiler itself from 70 down to 40 yet it is still coming out way to hot for me and everyone else in the house. Is there anything else i can do to get the water temp down, as its starting to p**s me off now! i much prefer my old valiant!.
thank you for your time.

You sound like you are comparing your last system to your new one , they work completely different.
If you have stored hot water i.e cylinder, the water temp should be at 60 degrees , a combi will generally give you 45 ish .
The only way around it is to install thermostatic mixing valves at your hot taps .
However , borrow or buy a thermostat and see what temperature you are getting at your hot taps and if its way over 60 reduce the temperature through your cylinder thermostat .

 

[king of pipes]

Is there a immersion heater been left switched on ? Kop

 

[Leeccc]

Could be a fault with boiler, cylinder stat.

Needs looking at.

Nice problem to have though when normally people have no hot water.

Any chance you have a thermometer and can take a reading?

hi simon, unfortunatelyi dont! as i said my previous setup was a simple combi. A fault already? i hope not as it was only installed in july!

 

[Leeccc]

Is there a immersion heater been left switched on ? Kop

the water tank in the airing cupboard, ive looked at the plug for the immersion and it is off. Im hoping it isnt my thermostatic shower valve as this is built into the tiled wall

 

[SimonG]

Could you upload some photos of the airing cupboard?

 

[Leeccc]

You sound like you are comparing your last system to your new one , they work completely different.
If you have stored hot water i.e cylinder, the water temp should be at 60 degrees , a combi will generally give you 45 ish .
The only way around it is to install thermostatic mixing valves at your hot taps .
However , borrow or buy a thermostat and see what temperature you are getting at your hot taps and if its way over 60 reduce the temperature through your cylinder thermostat .

Hi there, there is a small drayton white box at the base of the water tank with temps on, it was on 55. its connected in part to the timer above.

 

[townfanjon]

Hi there, there is a small drayton white box at the base of the water tank with temps on, it was on 55. its connected in part to the timer above.

Yes thats what we would expect , just buy a cheap thermometer from hardware store / b and q etc and check it is leaving the cylinder at roughly 55/60 . If it is its ok .

 

[Leeccc]

Could you upload some photos of the airing cupboard?

ok give us a minute.

Could you upload some photos of the airing cupboard?

 

[Leeccc]

Yes thats what we would expect , just buy a cheap thermometer from hardware store / b and q etc and check it is leaving the cylinder at roughly 55/60 . If it is its ok .

The kitchen and bathroom basin come out a manageable temp.

 

[Leeccc]

The kitchen and bathroom basin come out a manageable temp.

Tell a lie I've just run bathroom tap, just as hot now.

 

[SimonG]

Aye, really need to get hold of a thermometer to double check.

 

[Leeccc]

Aye, really need to get hold of a thermometer to double check.

Where's the best spot to place the thermometer. Piping itself?

 

[SimonG]

I'd be happy just running it under the hot tap to get a peak reading.

 

[Leeccc]

I'd be happy just running it under the hot tap to get a peak reading.

Ok Simon, thanks

 

[Allgoode]

Looks like the cylinder stat may either be a installed bit low on the cylinder or reading incorrectly.
Basically it is reading the water temp at that position & not at the top of the cylinder where the water is drawn off to your taps/shower.
If it was me i would be using the temp sensors on my FGA to give readings of supply/return temps to cylinder from the boiler which would give me an idea of the potential temp at the top of the cylinder prior to boiler shut down.
I could also attach one of the sensors to the cylinder hot outlet pipe to find out that temp.
You could by trial and error turn the cylinder stat down a bit futher & see what difference that would make to overall deliver temp but bear in mind your potential store of hot water would be at an overall lower temp.
As your system has a pump, for shower? then your shower should ideally be thermostatic which will allow good temp regulation & prevent scalding if there is any temp issues.
It is a relatively simple fix for someone with right gear or if you want to slow time adjust down cylinder stat then that may give you your ideal compromise.
Also bear in mind if the hot water is not regularly used/cycled then there is the risk of legionaries due to overall cylinder temp.
Hope this helps,
Andy

 

[dan_the_plumber]

No you need your cylinder stat on 60-65 degrees. Have you tried actually measuring the water temperature which comes out of the tap?
If it is higher temp than this your Emersion heater may be on?
A simple test is to turn the boiler off and then have a bath, do some dishes etc etc. If you don’t run out of hot water then the emersion is on!