How to competely switch off DHW on Worcester Heatslave II oil

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gjf60 New Member
I have recently had a Worcester Heatslave II 18/25 combi installed in my kitchen
After installation I told the installer I don't use the hot water and how to turn it off to save energy. He said just put it into Eco mode but not to turn down the DHW temperature on the boiler. I have read the function of the Eco mode but wouldn't it be more economical to turn the temperature right down ? I would like to be able to turn the DHW off completely to save energy.
In the boiler instruction booklet for DHW it says it is recommended that the boiler is timed off with the programmer over night or when the home is unoccupied. My boiler came with a Honeywell CM700 wireless programmer which just seems to control the boiler on or off with no separate control for DHW.
 
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If there hasn’t been a twin channel programmer fitted then there will always be a signal to heat the tank I think.

Without a twin Channel timer, there will be a link wire between mains live and (domestic hot water) dhw LR (live return) terminal. So basically always a demand to heat the store.

I think this is correct.

A twin channel external programmer or a Worcester plug in programmer would get around this
 
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I don't' have a circuit diagram for the boiler. I could remove a link if you can describe where to look.
 
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1BC2AC35-6945-4299-B4D2-30F63458A06C.png I don’t think you will get hot water at all if you remove link though.
 
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Just turn down the DHW control. This will lower the temperature of the heatstore and switch over to the heating, thus achieving your objective.
 
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Just turn down the DHW control. This will lower the temperature of the heatstore and switch over to the heating, thus achieving your objective.
Post #1 said he had been told not to do this?
 
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Post #1 said he had been told not to do this?
Yes, but only by the installer who probably did not listen to what was asked. If the OP does not need hot water, then turning the temp down will be the only way to achieve it without making significant changes to the appliance wiring, thus invalidating the warranty.
 
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Yes, but only by the installer who probably did not listen to what was asked. If the OP does not need hot water, then turning the temp down will be the only way to achieve it without making significant changes to the appliance wiring, thus invalidating the warranty.
Sincere apologises I should not of posted what I did, don`t know why I even replied tbh and agree a twin channel programmer would of been better in this case. (y)
 

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