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Sterald.

Last year, I swapped my 48 inches single panel radiator with double panel 48 inches rad and made a huge difference to heating the room. Its a 250 sq.ft room (~22sq.m). I did not wanted to change the piping so went for the same size in double panel.

Many Thanks again, just the info I was looking for.

Yes, it has a pressure relief valve but no guage. I know its a funny system that I am trying to understand as well!

What I meant to say that my existing setup has a PRV but no EV. I need to add EV to set it as pressurised system.

Yes, there was a prv on on my existing boiler as well, and an EV, that's it?

This location ticked all the right boxes apart from height which I didn't know about earlier. This suits me to add DHW to this locaion as well in future. I read somewhere earlier that OV boilers can be used in sealed systems that's why I went with this boiler. I weighed my options earlier and...

I have sent them an email for confirmation already. It doesn't have pressure guage, not sure about PRV inside the boiler.

If boiler can be placed anywhere in the system; what are the locations where it cannot be placed? Just a thought, I know you said it depends on pipework but considering its a two storey house; the farthest lenght is 100ft from boiler (flow only).

That's the beauty of brainstorming and collective wisdom (wisdom obviously shared by yourself and fixitflav)!

That's a good idea but I was avoiding pressurised system due to potential leaks in existing pipework. Boiler being an OV boiler can also work in pressurised system.

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.

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.

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

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.

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

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!

That's great then. I have, and its not a great spot for room sealed boiler. I still can have it install there with a weatherproof box around the boiler at a cost of slight inefficiency. The other reason was that I wanted to keep the old boiler installed at that location as backup.

Thanks. Its 2m + 0.45m so can't install the boiler in Balcony with 2.1 m available height? If I have to install it at that location which is my only option since it is covered, excellent gas pressure, condensate drain and is closer to bedrooms and lounge then I have to take the cistern over the...