Water very hot

NIMAN

When I put on heating to heat water at home, it is too hot. To the stage that you can't keep your hand in it.

Not sure how I'd adjust?

This is the only gauge of any sort I can see in the hot press. Not sure if it's connected or not as I turned it down in the past and didn't seem to have had any effect.

Any ideas?

Ubbquittious

There may be another one on the cylinder itself, underneath the cover where the the wire goes in. Turn off the power to it before u go at it. This is presuming you are using the electricity to heat it and not a boiler.

Jim_Hodge

Are you heating from a boiler? That's where the thermostat is. That one looks like what we have for a pump from the back boiler.

NIMAN

Heating it using the oil.

Jim_Hodge

https://www.boards.ie/discussion/comment/119253804#Comment_119253804

There has to be a thermostat on the boiler.

NIMAN

Sorry, plumbing ain't my forte!

Is this it?

Jim_Hodge

https://www.boards.ie/discussion/comment/119253863#Comment_119253863

Yep. And it could well be faulty.

NIMAN

Why do you say that?

Because the temp is set at the lower end, but the waters still roasting?

John.G

The boiler stat is set to ~ 68C which is normal enough but if you don't have a motorized valve controlling the cylinder temperature then the cylinder will reach close to the boiler temperature, the yellow pipe stat is measuring some pipe flow temperature, maybe you have solid fuel as well, then this could be used to switch on/off the solid fuel circ pump. If you have cylinder temperature control then you should find a cylinder stat which looks like that pipe stat but will be strapped directly on to the (bared) cylinder ~ 18ins from the bottom and you will have a motorized valve on the inlet (top) pipe on the coil heating the cylinder.

NIMAN

Many thanks for the detailed reply John G, but that was like another language!

I'll speak to a plumber.

Wearb

Do you ever have to reset anything at the boiler?

NIMAN

https://www.boards.ie/discussion/comment/119254119#Comment_119254119

No. Would get it serviced every couple of years, outside of that nothing.

It had a part replaced at last service, and was told its seen better days, but seems to be still working OK for now. Its approx 20/21 yrs old, think it's the original one when house was built.

John.G

If the boiler (burner) is cutting in and out then most likely that nothing wrong with the boiler stat, if there was then the boiler would lock out on the hi limit safety stat which has to be manually reset.

NIMAN

No, it cuts in and out as normal.

Wearb

https://www.boards.ie/discussion/comment/119253863#Comment_119253863

Anything in that range is going to feel very hot to the touch. Even taking into account the heat loss along the way, it's still going to feel like it's too hot.

You could have a cylinder stat fitted or a tempering valve.

If the temperature seemed ok in the past, what has changed since then? Perhaps that boiler stat is faulty, but switching off well before the high limit activates. You dont happen to have an immersion fitted that's remaining on?

NIMAN

No, immersion switch hasn't worked in a few years.

The water was always hot, this isn't a new thing.

I'll follow up on the advice given, thanks folks.

dathi

https://www.chadwicks.ie/caleffi-22mm-tmv3-mixing-valve-28-lpm-84193.html

either but a cylinder stat on cylinder wired back to the boiler that cuts out the boiler when set temperature is reached. or put a thermostatic mixing valve on it to blend the water to the correct temperature.

jimf

most likely the run stat on boiler is gone out of calibration

Tom44

https://www.boards.ie/discussion/comment/119258131#Comment_119258131

I agree, new stat needed, it's a common enough complaint. Water getting very hot, but not quite hot enough to shut off on the emergency overheat button, which is about 90°c ( under little black cover )

It's not as accurate as it once was, or it's slipped out of the boiler a bit and not making good contact.