Stat change - drain or not?

[LeeUK]

Hi

Need to change a thermostat on a Heatrae Sadia tank (cl125).

I think its the single stat type (near the bottom).

I presume these can be changed without draining the tank

Am I right or do I need to drain?
Also, are these stats universal or model speciifc?

Cheers

 

[picasso]

you dont need to drain and the stat is particular to your cylinder, take the old one with you when you go to buy a new one.

 

[LeeUK]

thanks for the reply

Just looking at prices online - same make stat showing £147
I was thinking £30!

 

[LeeUK]

finding more realistic prices now

one says with safety cut out

I am changing 2 stats, same boilers different houses and both have gone!
have been using oil to heat the water, tried stats and not working

Im thinking there is a safety cut out

where is this and does it rest itself or via a button?

 

[picasso]

got a link to the 147 one ? the stats are about £20- £30

 

[picasso]

thought you were talking about the electric stat.

 

[LeeUK]

it is an electric stat
getting different images online to a resetable stat so it might not have tripped, just broken

£147
http://www.directheatingsupplies.co...=google&utm_medium=base&utm_campaign=products


think best to look for a reset button now and get the part number

thanks for your help

 

[picasso]

the cl 125 is an indirect cylinder, why are you using the back up immersion heater ?, the stat has a resettable button you just need to look a bit closer for it.

 

[LeeUK]

not mine but as far as I know the owners have been using the oil to heat the water off programmer
I suggested they use the elec immersion to heat over summer, they had a problem with the boiler (not switching off) which is now sorted, next job is the immersions

back up immersion heater?

 

[picasso]

electric is the most expensive way to heat water so if you have an indirect cylinder the immersion heaters are just for emergencies ie a back up .

 

[LeeUK]

perhaps its less trouble long term, they are holiday homes
that said they are not on a timer like the oil is

going to see if there is a reset

now the problem with the boiler is solved maybe they will keep it on the oil