Ask The Trades - Print Page

Ask The Trades
https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Location of DHW cylinder https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1369822572 Message started by peadar on May 29^th, 2013, 11:16am

Title: Location of DHW cylinder
Post by peadar on May 29^th, 2013, 11:16am

We are in the process of upgrading our heating system and are considering moving our DHW cylinder from the second floor of our house to the ground floor. The system is an indirect open vented system. Based on the laws of gravity and head of water requirements can this be done without adding a booster pump to the system to keep my upper floor pressure as it is now? I have attached a crude diagram to illustrate[gallery]peadar/1369822322.jpg[/gallery]

Title: Re: Location of DHW cylinder
Post by thescruff on May 29^th, 2013, 1:38pm

Hi,

Wont make a lot of difference although you should upgrade the cold feed to the next larger to prevent air problems on the top floors.

Title: Re: Location of DHW cylinder
Post by CWatters on May 29^th, 2013, 2:39pm

I agree. Won't make much difference to the pressure.

As drawn it will take longer for the hot water to come through to the outlets. For example to get to the outlet on the ground floor it has to go up to the top of the house and back down.

Perhaps this is possible...

[gallery]CWatters/1369834697.png[/gallery]

Title: Re: Location of DHW cylinder
Post by CWatters on May 29^th, 2013, 2:42pm

What other work is planned? Have you considered changing to a mains pressure hot water system (of which megaflo is just one type/brand)?

Title: Re: Location of DHW cylinder
Post by peadar on May 30^th, 2013, 12:01am

Thanks folks for your comments i had ruled out mains supply cylinder only for the simple reason of no back up if supply is interupted.... I might actually rethink this as the mains pressure is better than my present hot water pressure frommy tank. See additional dawing showing new "Pea Coal" boliler that i am having installed the only reason i was going to move my cylinder was to have it directly on the primary loop from the boliler to utilise the recovery time of hot water depletion.I like the spec of the megaflo. (Present tank 114l new tank will be 300l.....7 people in this house![gallery]peadar/1369868388.jpg[/gallery]

Title: Re: Location of DHW cylinder
Post by Lectrician on May 30^th, 2013, 7:04am

I would go for the megaflow (or similar) and try to shorten that pipework to the hot taps as CW has suggested - Seems a waste having to take the hot water that sort of distance!

Title: Re: Location of DHW cylinder
Post by thescruff on May 30^th, 2013, 9:20am

Yes go for the Unvented, we don't get water cuts enough to worry about it.

Connect from the closest to keep the runs as short as possible.

You also need to re-think the heating, as you show it is wrong and the rads will be bet hot when the boiler is on, summer and winter.