Hot water too hot

drofluf · September 2023

I’m trying to sort out my monster-in-law’s hot water which is scalding hot. My wife is up there but I’m 200 miles away so who better to ask than a group of people who also don’t know how it’s set up

Boiler is a Glowworm Flexicom hx but doesn’t appear to have a temperature control on it like other boilers I’ve owned. Would there be a thermostat on the hot water tank?

any thoughts appreciated I’m not 100% convinced it has a standard set up so anything off-beam may help!

ICBM · September 2023

There should be a thermostat on the tank. It may be on the top under a dome-shaped cover which you will probably need a small spanner to undo - it's usually held on with a crown nut, on the ones I've seen - or attached to the side with a strap that goes around the tank, probably hidden under the lagging.

drofluf · September 2023

Thanks!

Kittyfrisk · September 2023

Instructions are here https://www.glow-worm.co.uk/glow-worm/products-1/flexicom-1/flexicom-hx-user-157171.pdf
Section 8.3 tells how to adjust the temperature.
Hope this helps.

drofluf · September 2023

Kittyfrisk said:

Instructions are here https://www.glow-worm.co.uk/glow-worm/products-1/flexicom-1/flexicom-hx-user-157171.pdf
Section 8.3 tells how to adjust the temperature.
Hope this helps.

Thanks I’ll pass it on

boogieman · September 2023

Kittyfrisk said:

Instructions are here https://www.glow-worm.co.uk/glow-worm/products-1/flexicom-1/flexicom-hx-user-157171.pdf
Section 8.3 tells how to adjust the temperature.
Hope this helps.

That’s ^ to adjust the flow temperature of the boiler I think, not the hot water temp. There should be a thermostat on the hot water tank, as ICBM says. It’s normally strapped to the side of the tank and can be adjusted, there’s a little pointer that you line up with the temp scale. You want it set around 60 degrees. Don’t go too low as there’s a risk of bacteria/legionella at lower temperatures.

Dominic · September 2023

the one on the tank musn't be confused with an immersion thermostat
easiest best is to fit a simple thermostatic valve somewhere on the flow or a mixer tap

ICBM · September 2023

Dominic said:

the one on the tank musn't be confused with an immersion thermostat

There will be two if it's a dual system with an immersion heater as well - but if the electric heater isn't connected, the immersion thermostat can be used to operate the gas system, in which case it may still be under the domed cover on top. That's how it was done in my old house! It is more normal to have the gas one strapped to the side of the tank though.

boogieman · September 2023

Dominic said:

easiest best is to fit a simple thermostatic valve somewhere on the flow or a mixer tap

I’m not sure how it’d be easier? You’d need to drain all the pipework down first and then cut into the pipe to fit a valve. But I have to be honest and say I’ve never seen a thermostatic valve fitted on a domestic hot water supply. On a shower, yes, and of course there’s often TRV’s on the radiators, but hot water? Nope.

It’d be far easier to just find the h/w stat on the cylinder and adjust it. The most common type is a small rectangular box strapped to the side of the cylinder.

Kittyfrisk · September 2023

boogieman said:

Kittyfrisk said:

Instructions are here https://www.glow-worm.co.uk/glow-worm/products-1/flexicom-1/flexicom-hx-user-157171.pdf
Section 8.3 tells how to adjust the temperature.
Hope this helps.

That’s ^ to adjust the flow temperature of the boiler I think, not the hot water temp. There should be a thermostat on the hot water tank, as ICBM says. It’s normally strapped to the side of the tank and can be adjusted, there’s a little pointer that you line up with the temp scale. You want it set around 60 degrees. Don’t go too low as there’s a risk of bacteria/legionella at lower temperatures.

Yes I get that, I was thinking that it would be a sight easier & faster for someone that doesn't know what they are doing, to reduce the overall water temperature to reduce the scalding risk in the short term. Then get someone in that has more experience later.

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Hot water too hot

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