Length of Pipe from Cylinder

[Belboz]

Is there a minimum length of the 'hot' pipe which comes from the top of the cylinder?

I read somewhere that there WAS a minimum length before connecting it to anything like plastic pipe//fittings but I'm not going to be doing that.

Reason is, as I have said in another thread, I am looking at moving the cylinder.

The current setup has a fairly long length of pipe from the top of the cylinder - horizontally. If it was kept at the same length after moving then it would mean I would have to look again as to where to site it as the extra width would cause an issue.

If there IS a minimum, what is it please? If not, how soon after the connection to the top of the cylinder can you make a bend and is there anything to stop it going down vertically?

Yeah, I know - more stupid questions from eejits but the whole point of this is that, before I get the qualified plumber in to move the whole shebang, I want to be able to tell him [or her!!] exactly what I want.

I've read enough and know enough tradespersons to know that you should know EXACTLY what you want instead of chopping and changing your mind.

If I know the answer to this one then I will be able to tell the plumber precisely where I want the cylinder instead of him [or her!] arriving and telling me I can't put it there.

Make sense?

Probably not so apologies in advance.

 

[simond]

Most tradesmen could take exception to someone telling them that they would design the cylinder pipework from an internet forum.

I suggest you let the tradesmen tell you what is possible rather than the other way round, or you will find the written quotes all mysteriously get lost in the post.

It is not uncommon for people to post on here saying that they have had 7 people round and no-one has quoted. They blame the industry but truth is, we all want the work, unless someone or something has royally dissuaded us.

You can use plastic pipes (of a suitable type) straight off the cylinder. It would look pony but you can do it.

The HW outlet needs to have access to the open vent (if it is an open vent cylinder) without any intermediate drops from near horizontal. Otherwise airlocks will result, particularly overnight after the water bubbles have had a good chance to build up.

 

[powell30]

And it's usual practice to incorporate a 45+mm offset in the run straight from the cylinder to aid air seperation. As simond says, plastic is ok but if you design it around 'space' rather than correct design your asking for trouble.......

 

[Belboz]

simond,

Thanks for that but I have no intention whatsoever of telling the plumber the pipe layout nor designing it myself.

I asked the question because, as I said, I am employing a plumber to move the cylinder downstairs.

The cylinder is currently in an airing cupboard which, obviously, is wide enough to hold the cylinder and pipework.

At it stands, the pipe comes off the top of the cylinder and then joins what I presume to be the vent pipe to the loft. The horizontal pipe then continues until it bends downwards towards the feeds.

This bit between the vent pipe branch and where it goes down vertically to the feeds is fairly long and, therefore, as it is the widest part of the cylinder and pipework, determines how big the cupboard which hold it is.

When looking at where I want to site the cylinder downstairs, the site has a maximum width which is smaller than the current width of the cupboard upstairs.

However, if the pipe which FOLLOWS the vent pipe branch is shorthened so it bends vertically sooner than it does currently, the cylinder site will be fine.

If not, then I would need to look at an alternative site because the pipework would need X width.

I leave plumbing to plumbers and sparks to sparkies. I can do a bit of both but I wouldn't even consider trying to tell a professional how they should go about it. If you tried to tell me my job then I'd tell you to poke it which is what I expect any professional plumber would say.

All I wanted was to know if this was feasible. If not then I will choose another site so I can tell the professional where I want it instead of mucking them about saying , "Ermm I don't know where I want it moved to" at the start.