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Ask The Trades › DIY Forum › Plumbing Questions › unvented systems-any good?

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unvented systems-any good? (Read 2255 times)

peter

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unvented systems-any good?
Jan 23^rd, 2005, 12:19am

i am replacing the CH system to my recently extended and now 5 beds 2 bath roomed house. It will have two thermostatic showers.

Ive been told that i will need at least 115,000 output for rads
20 rads in total.

I have also been told the best option is unvented system the new way forward now a days as combi not up to the job.
i am looking at Vaillant 637 with 150lts Vaillant Vantage water cylinder. will this be sufficient for job and has anybody got any experiance with unvented systems.

Any Advice would be appreciated

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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: unvented systems-any good? Reply #1 - Jan 23^rd, 2005, 12:31am 150 lts is pushing it a tad close if all the bathrooms are used at the same time, 220lts would be the norm in my calculations. Unvented cylinders depend on a good pressure (3 bar) ideal, and a good volume (30/40 lts min), so both need to be checked
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bstyle GDPR opt-out Total Thanks: 147 For This Post: 0	Re: unvented systems-any good? Reply #2 - Jan 23^rd, 2005, 12:37am In my experience on multi Bathrooms you need to renew the cold main from external stopcock to a larger diameter, a lot of work but the flow rate was up to scratch once this was done.
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greg GDPR opt-out Total Thanks: 147 For This Post: 0	Re: unvented systems-any good? Reply #3 - Jan 24^th, 2005, 6:31pm make sure that the cylinder is located close enougth to an external wall for the discharge pipe to exit
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