Joining two unvented hot water cylinders together

[Chrismac]

Any suggestions or advice on combining two 250 litre unvented cylinders together.:whatchutalkingabout Cheers

 

[Chrismac]

Hahaha, got to get back its not holding up on the g.t.t, might have to get me matchs out.

 

[lame plumber]

did g3 today and anything 500 or over it would seem has to be designed by manufacturer to cover ones bum so I would ask the makers for full spec on 2 times 250 myself if thats the case

 

[Chrismac]

Thanks for that, I don't remember having that info when I did the g3 but was going to contact them before I start the job. Cheers

 

[bill9005]

if you now how to fit one , what stoping you fitting two together ?

the thing is, i know exactly where Chrismac is coming from. if you have never banked two cylinders together, it can be a very daunting task. the task itself is very easy on paper but when your trying to get your head round it for the first time, it can be difficult no matter how much you've trained. when i did my g3, they didnt say anything about putting two together, so when i was asked to do it at my previous place of work, i was quite suprised, and tbh stumped on how to go about doing it!! we went down the route that lame plumber suggested, we actually got a full system diagram from megaflo.

hope this helps chrismac

 

[chris watkins]

View attachment 2 x Megaflo Eco Indirect.pdf
I don't know if the above will help. Don't forget 2 x zone valves required 1 on each controlled by its own cylinder stat / HL.

 

[vern]

View attachment 12273
I don't know if the above will help. Don't forget 2 x zone valves required 1 on each controlled by its own cylinder stat / HL.

LMAO even HS Megflo cannot get thier drawing correct........

Being anal and good plumbing practice, regards the oulets of hot from both cylinders the T should be equi distant from each cylinder so the internal resistance is the same, I.E they both receive even use etc (even more important on vented regards hot and cold) i would say the same for the primaries too, but in the case of 2 fitted together i would feed from a LLH
anyhow

I also think the zone valves should be shown as they're an important safety device, i appreciate there is a note in the text regards this

 

[Dotty]

But I will be upping me post count..

Drop the attitude or you'll be getting into NONE of the private forums, regardless of post count!

 

[Chrismac]

Thanks again for this advice, I can understand people getting a bit funny about given too much advice over the net for every Tom dick & Harry to try there hand, I have installed loads of unvented over the years but never had reason to marry two together, my main concern was primarily that one cylinder does not do all the work which would let the other stagnate, verns info has highlighted what I've assumed in regards to keeping everything balanced or maintaining an (equilibrium) big word for Saturday.. Will be constructing my own LLH out of cu prob in 42mm.

 

[Chrismac]

Hi croppie, I was actually writing my last post when you left your last post so I did not read yours till after I posted. Apart from that I understand where your coming from. As your all aware I'm new to this forum which is no excuse, what I have observed over the last few days with this forum is there are a lot of professional & informative people contributing to public awareness in regards to gas issues, this is a very important forum & not just a load of people having a laugh, so I apologise for the attitude displayed on this forum, & hope it has not offended or caused anyone upset. So apologies to all.

 

[josh]

That megaflo drawing in relation to the secondary loop is wrong in my oppinion,
on a single cylinder installation with a loop you have the check valve to prevent reverse circulation (water being drawn out the secondary tapping and going to the dhw outlet rather than coming from the proper outlet), in that drawing it is possible for one cylinder to be drawn out of the secondary tapping and into the other one, i would have a single check valve on both tappings.

Maybe thats me just being anal there?

 

[Guest123]

Insulting behaviour towards members only trying to help you will not be tolerated on this forum.
THREAD CLOSED.