Flow- Vent- Feed -Pump

[fixitflav]

Given Viessmann have sent you information stating that 1m head is within spec,

Have they? The only one I've seen is in #31, where the 40" was added by desktop.
In any case, 2.1 - 0.45 - 1 - 0.6 = 50mm bottom of boiler above floor. Flow and return out the top might be OK, but gas and condensate could be a struggle.

 

[desktop987456]

It still looks tight to me.

Yes, it is tight for space, I'll try to fit in the boiler within this space, and see if it works as it should, if not, then will think of something else!

 

[desktop987456]

I don't think the warranty would even be in play.

Yes, I am not looking for warranty either, I'll stick to the plan of fitting it to the available space, fingers crossed!

 

[denso13]

Have they?

Post #45

 

[fixitflav]

Post #45

OK, missed that. I wonder if the Viessmann guy who sent it had read the manual in #50.

 

[Madrab]

OK, missed that. I wonder if the Viessmann guy who sent it had read the manual in #50.

That's the manual for the variant that the OP has, which is not the US version of the boiler.

@desktop987456 , was it Viessmann US support that mailed you that min height info? As suggested as long as you have the height to provide enough head of water to fill and purge the system then fine, the height of the vent above the level in the cistern (450mm) is to allow for pump surge and expansion, so as long as you obtain that then I would hope you'd be ok.

 

[desktop987456]

I sent an email to Viessmann Technical Support UK, extract attached as received. The 1m mark in red color is from Viessmann UK, I have not edited it.

I am using the UK version of the manul.

 

[Madrab]

OK - strange that they contradict their own manual - not to worry though, if they subsequently suggest that 1m head is the required distance and supply a diagram to show that then fair enough and that should ok.

 

[desktop987456]

OK - strange that they contradict their own manual - not to worry though, if they subsequently suggest that 1m head is the required distance and supply a diagram to show that then fair enough and that should ok.

I'll go ahead with installation with these dimensions and see if this works out.

 

[Madrab]

As it is going to be installed in open balcony, from technical stand point does not having a flue affect the functioning of the boiler for comubstion?It can take oxygen for combustion from open flue, can't it?

Erm - What??

That's illegal here in the UK, it has to have a flue. If nothing else other than to direct the POC gases away from where people may be. It does also ensure that the flue gases don't mix with the intake.
I don't think you'll get an opinion on that in here, as that's potentially very dangerous, can affect the way the boiler performs and not recommended at all.

 

[desktop987456]

I don't think you'll get an opinion on that in here, as that's potentially very dangerous, can affect the way the boiler performs and not recommended at all.

Erm - What??

That's illegal here in the UK, it has to have a flue. If nothing else other than to direct the POC gases away from where people may be. It does also ensure that the flue gases don't mix with the intake.
I don't think you'll get an opinion on that in here, as that's potentially very dangerous, can affect the way the boiler performs and not recommended at all.

Edited : As I said purely from a technical standpoint since it is installed on outside wall would it still affect the air intake. The area where it will be installed is un inhabited mostly and will only accessed for servicing after isolation. But I undrstand.

 

[Madrab]

Totally appreciate your approach @desktop987456 and I do understand that things can be done differently in the US but unfortunately due to possible safety issues and concerns and even down to litigation, I can't see anyone from here taking an opinion on whether doing something like that would be ok or not.

That being said technically I would say there is a high chance that the flue gases would contaminate the intake if the flue was left open like that and for the sake of £100 for a vertical flue

 

[desktop987456]

Totally appreciate your approach @desktop987456 and I do understand that things can be done differently in the US but unfortunately due to possible safety issues and concerns and even down to litigation, I can't see anyone from here taking an opinion on whether doing something like that would be ok or not.

That being said technically I would say there is a high chance that the flue gases would contaminate the intake if the flue was left open like that and for the sake of £100 for a vertical flue

I understand and I really appreciate all the help you have extended in this issue. Thanks also for clarifying the odd and no so welcome question.

 

[Madrab]

More than happy to help @desktop987456 , it's just unfortunate that we here in the UK have a strict set of rules when it comes to gas appliances and those rules extend to this forum. That being the case us gas chaps are not in a position to offer DIY'ers advice of how to do something with gas appliances, especially if it has the ability to create a dangerous situation.

If you want my recommendation though, I'd go a get a flue for your boiler, as that's how it's been designed and tested to work properly.

 

[fixitflav]

I sent an email to Viessmann Technical Support UK, extract attached as received. The 1m mark in red color is from Viessmann UK, I have not edited it.

I am using the UK version of the manul.

Just another thought on this - we've been trying to get an OV system in a 2.1m high space, and it doesn't work at all satisfactorily. I usually prefer OV over pressurised, but in this instance the latter could make a lot of sense. Might even be able to fit the boiler at a convenient height!