Has anyone got Viessmann 111w - problem

JakubJakub

Hi,

I have a problem with Viessmann 111w

I have a Vicare sensor and app.

It goes like this : 

If I have a boiler in DHW only everything works as it should, but then I switch it to DHW and heating. Temperature in a room is 21 degrees. I set the boiler to come on when the temperature is 17 degrees.

Every time I run a hot water, boiler comes on, fills a hot water tank, and as soon as it switches off, it dumps a lot of hot water into the radiators. Every time.

I put my baby to bed at 7pm (and my heating is on from 7) and I still have a shower, do washing up, wash my hands etc. Every time it dumps hot water to the radiors. By 10-11pm when I go to bed , temperature in the bedroom is 25-26degrees! 

I had Viessmann engineer coming 4 times, he can't figure  out what's wrong. Now they start telling me it's normal, that it has to dump that water to radiators. Surely that's not normal. My bedroom gets hotter every time even I don't want it to. And it doesn't dump any hot water when only in DHW mode. 

Anyone might know what's going on? I'm not wrong it's not normal, am I?

Anyone's got the same boiler and could check for me what does your boiler do?

I would really appreciate any help.

Thanks

Jakub

ThisIsWeird

No idea. But it's certainly not usual for other makes

Try emailing Viessmann?

JohnB47

I'm not sure what you mean by "Every time I run a hot water, boiler comes on, fills a hot water tank ......"

What tank? 

As for dumping, yes my Worcester Bosch boilers have always done this. I believe it's to flush the hot water from the innards.

The thing is, it's always been only a small amount - the pump runs only for a few seconds and that plug of hot water is soon dissipated in the CH water.

Is your baby's bedroom perhaps directly above the boiler so that excess heat always rises to it? 

Also, we have our boiler always set to Eco mode, otherwise the boiler keeps blipping the heat on occasionally to ensure any DHW runs hot quickly.

Is yours perhaps not set to Eco, or equivalent?

macman

The 111W is a storage combi, so the 'tank of hot water' referred to by the OP is presumably the small storage tank within the boiler. But this serves the DHW circuit and has nothing to do with the CH side.
OP, have you tried switching off the storage mode?

JakubJakub

macman said:

The 111W is a storage combi, so the 'tank of hot water' referred to by the OP is presumably the small storage tank within the boiler. But this serves the DHW circuit and has nothing to do with the CH side.
OP, have you tried switching off the storage mode?

Hot water cylinder inside the boiler, yes. 
I am not sure I can switch off the storage mode...,🤔

I would understand if it always needed to dump hot water . It doesn't need to do it when in DHW only mode, so why would it need to do it when in heating mode (even if no heating is running, as the thermostat is set so low ) 
Also, they told me the pump circulates this water for a few minutes.
Also my neighbour who is a heating engineer said modern boilers have a short circuit inside to get rid of that hot water. 
I am confused. 😅

BUFF

JakubJakub said:

Hi,

I have a problem with Viessmann 111w

I have a Vicare sensor and app.

It goes like this : 

If I have a boiler in DHW only everything works as it should, but then I switch it to DHW and heating. Temperature in a room is 21 degrees. I set the boiler to come on when the temperature is 17 degrees.

Every time I run a hot water, boiler comes on, fills a hot water tank, and as soon as it switches off, it dumps a lot of hot water into the radiators. Every time.

I put my baby to bed at 7pm (and my heating is on from 7) and I still have a shower, do washing up, wash my hands etc. Every time it dumps hot water to the radiors. By 10-11pm when I go to bed , temperature in the bedroom is 25-26degrees! 

Can't help with the boiler issue but do you have thermostatic radiator valves on your radiators?
You should be able to set them to close at the temperature you want thus preventing radiators (& room) from warming further.