Our main bathroom has developed a leak in the shower enclosure, so we planned to use the second, little-used bathroom which has has a Gem 88 mixer control. Like this: https://i.ytimg.com/vi/hCsltn3RpKg/maxresdefault.jpg
Then I found that the flow control was stuck. While reading through the installation manual, I noticed a comment that the mixer valve should not be used with a combi boiler. Ours does use the combi.
I managed to dismantle the valve and with a combination of brute force, ignorance and not a little luck, the flow control is now free, and the shower is working fine. But I am intrigued.... why should I not use a combi boiler to feed the mixer?
--kiloran
Got a credit card? use our Credit Card & Finance Calculators
Thanks to johnstevens77,Bhoddhisatva,scotia,Anonymous,Cornytiv34, for Donating to support the site
Mira Gem 88 and combi boiler
-
- Lemon Quarter
- Posts: 4092
- Joined: November 4th, 2016, 9:24 am
- Has thanked: 3234 times
- Been thanked: 2827 times
-
- Lemon Half
- Posts: 9129
- Joined: November 4th, 2016, 1:16 pm
- Has thanked: 4140 times
- Been thanked: 10023 times
Re: Mira Gem 88 and combi boiler
kiloran wrote:
I managed to dismantle the valve and with a combination of brute force, ignorance and not a little luck, the flow control is now free, and the shower is working fine. But I am intrigued.... why should I not use a combi boiler to feed the mixer?
There's a post here (last post on Page 1), with the following note from Mira technical support regarding your specific shower, and the reasoning behind not using it with a combi-system -
"Additionally, the Mira Gem 88 is only compatible with pressure-balanced plumbing systems (i.e. gravity, pumped, unvented). As a pressure imbalance between hot and cold supplies from a combination boiler will be evident, we cannot guarantee that this shower valve would produce a stable blend temperature. A pressure imbalance would also cause the seals within the shower valve to lift so you would therefore experience a leak. "
https://community.screwfix.com/threads/ ... mbi.79344/
Cheers,
Itsallaguess
-
- Lemon Quarter
- Posts: 4092
- Joined: November 4th, 2016, 9:24 am
- Has thanked: 3234 times
- Been thanked: 2827 times
Re: Mira Gem 88 and combi boiler
Thanks for that link IAAG.
Does sound a bit odd to me, I would have thought that the hot and cold would be pretty well balanced since they both feed from the cold water main.
Maybe a problem if another tap is turned on or a loo is flushed, but I would have thought that would have a more or less equal effect on hot and cold.
Anyway, the shower will only be in use for the next day or two while I replace some silicone sealant on the main shower.
--kiloran
Does sound a bit odd to me, I would have thought that the hot and cold would be pretty well balanced since they both feed from the cold water main.
Maybe a problem if another tap is turned on or a loo is flushed, but I would have thought that would have a more or less equal effect on hot and cold.
Anyway, the shower will only be in use for the next day or two while I replace some silicone sealant on the main shower.
--kiloran
Who is online
Users browsing this forum: No registered users and 13 guests