can i use cylinder stat to control my immersion?

[texasholden]

Looking for a way to have a cylinder stat to liven up an immersion circuit when the water temp drops below say 50 deg.

I assume I can't run a normal cylinder stat in series with the immersion due to the high current. Any advice would be appreciated!

 

[Newboy]

the thermostat on the immersion heater should do the job - leave the immersion switched on and the stat should switch the immersion on when the cylinder temp drops below the set temperature

 

[texasholden]

That would solve my problem as stated - only I wanted to be able to overide the cylinder stat at other times and heat the water to a higher temperature (i.e. for central heating).

Hence why I'm looking to try and use a cylinder stat. Is it possible to use a relay?

 

[Onetap]

That would solve my problem as stated - only I wanted to be able to overide the cylinder stat at other times and heat the water to a higher temperature (i.e. for central heating).

Hence why I'm looking to try and use a cylinder stat. Is it possible to use a relay?

Clamp on cylinder stats are liable to fall off, causing the cylinder to overheat. You'd have the immersion thermostat set to the higher temperature, but that still leaves you with a scald hazard, unless there are TMVs fitted.

You shouldn't try to by-pass the immersion thermostat, not ever.

 

[andytw]

Without extra circuitry a clamp-on cylinder stat would not handle the 3kW 12A load of a typical immersion heater.

andytw

 

[Agile]

That would solve my problem as stated - only I wanted to be able to overide the cylinder stat at other times and heat the water to a higher temperature (i.e. for central heating).

What exactly do you want to achieve?

As stated you should never bypass a cyl stat because not only do they control the max temp but now have a second overheat device to prevent overheating if the first stage sticks on ( as they often do! ).

Tony

 

[texasholden]

Apologies for the lack of clarity - so maybe I should have worded:-

An economy 7 type meter energises immersion during off peak periods. I only need them to take the water to 50 deg.

However exceptionally (when their is high DHW load) I will need them to heat the water to a higher temp and so want the boost circuit to bypass the 50 deg limit, and heat the water to say 80 deg.

DHW is via a blending valve so tank temp will alter DHW capacity significantly.

I'll take the responses as confirmation that a 13 amp rates cylinder stat is uncommon at best!

 

[Agile]

Your solution would be to set the immersion stat to 80 C and to turn it off at a lower temp when not needed so high.

You will need to use a relay or solid state equivalent with a conventional cylinder stat.

Its recommended to run the cyl at 60 to prevent legionella. Or at least at a high temp once a week.

Tony