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Sure.

Ah, the pic in post 31 was from manual but I put the numbers various deimensions in it! Sorry if my editing has misled you. Viessmann technical support sent an email, this pic is not in any of the manual that I have seen for this model i.e. dimensions with water level. It wil be pretty tight...

Message from Viessmann technical support about height and static head for feed.

Thanks, will have it installed on Return just before the boiler; Is there a minimum distance limit or you an place it anywhere?

Sorry, max 150mm. The pipework and rads are in place and central heating worked with previous boiler fine (with integral pump; it was Grundfos with 5m head). I have never used an external pump in my system so this will be first experience. My initial estimates suggest that with 30k btu load the...

I am going to find out after installation. LPG is the back up option in case there is a difference in pressure. I am grateful to you for your time and suggestions and Fixitflav, you have clarified a lot of things which were bothering me. - Will put pump on flow (see pic); - it will be OV...

Got the dimensions from net for OV.

I can send a picture if you like, trust me it is without an expansion vessel, its a boiler from stoneage! It gets the job done of heating the house but with energy prices it is very in efficient. What is the advantage of having feed on return pipe, since I inted to install filter on return as...

I inherited the heating system and boiler and can confirm that what you have summarized is the case. I bought the UK version of the boiler, its a 13kw heat only boiler WB1B 2018 model. I have the manual. The part I wasn't clear about was do I need to change the existing feed to the boiler and...

- Pic 1 is currently what I have in terms of boiler and pipework. The boiler didn't have an expansion tank inside it; F&E was placed over on 1st floo Roger. What about the return line to the boiler?

I am with you, not the best job with the drawing, sorry if it confuses you. To simplify it further: - vent pipe added, Teed from feed tank - feed point is Neutral point of the system. - As you say the section between feed and pump inlet is under negative pressure - pump location showing inlet to...

Thanks, extremely helpful comments. Sorry if this confuses you but I wanted to confirm the return piping connection to boiler (see blob in pic dotted path to return inlet of the boiler)

Its a heat only boiler and as you say pump needs to be placed after f&V pipe with flow away which means into rads. My system layout is such that 9 rads are where the system is going to have positive pressure (in theory) but a couple of rads are on opposite side of f&v pipe as well, does this...

Which is I beleive what I have from F&E tank through a small dia copper pipe which looks 15mm to me. Yes, I have seen it in all reading material that I have gone through and wondered why I haven't got one. I looked at the old boiler and it has a PRV installed on flow pipe, I think I found the...

Thanks, Is there a specific reason for fitting a non return valve in Feed Tank? Existing pipework doesn't have a separate vent pipe going over the Feed cistern/tank. My open flue boiler was setup this way and has worked fine for years. Do I need to install a 22mm vent pipe separately? My...

The motorised valve, filter, pump came with the boiler (Viessmann 100-w heat only wb1b). I intend to install it for central heating system only as I have direct source for water heating. If this is installed correctly I intend to get an indirect cylinder (with coil and immersion element) and...

Ah ok.

It hasn't been fixed yet, I was just holding it this way to ascertain correct orientation. you mean the whole thing so pump is facing upward direction?

Thanks. I have got a pre plumbed pump and motorized valve that came with the boiler. I have marked the picture with arrows for clarity. What this small screw with a vent for (bottom left on pic) ? Secondly, Do I have the connections right from boiler and into the flow pipe? Thanks

I couldn't agree more but I thought I clarify this upfront based on my previous posts where I few members pointed that this is a UK forum so UK regulations apply in the forum. I have read a couple of books to get understanding of heating systems and I am on my learning curve, done heat loss...