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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...

I have selected this loation for new boiler on first floor. Gas connection, condensate drain, feed pipe (serving as common vent as well). My previous boiler was on ground floor just below this location and had a pump inside boiler, in 2nd photo you can see pipes going downstairs to rads. I am...

I thought, I'll start a new thread for clarification. Does this look right? If I have understood it clearly, it is a flow loop from boiler to rads?

I have labeled the original drawing from nairb999, Is my understanding correct for piping components? Sometime this month I'll have a new Heat only boiler installed (OV). Just want to make sure that I get it right; Open Vent Feed Pump, correct? And pump should be on flow pipe and after vent and...

See attached for help. 1. Do heat loss calculation; initially a quick calculation to get a feel for load then detailed calculation as per attached template. PM me and I will share some reading material to get you up to speed.

Are there resources available online to calculate pipe sizes (based on distances) to cater for required flow rates to run at different DTs.