Which thermostatic mixer shower with Combi boiler?

Just drop them an email, found them very helpful.

https://www.grohe.com/sy/10344/contact/

 

we have this https://tinyurl.com/gplhed5 on worcester bosch 32 combi and its perfect. Go with the Grohe. I'm pretty sure its also rated up to 13l/min. Of course, with a 15l/min boiler you'll still only just run 2 showers at once, and they will die if someone opens a tap elsewhere.....

 

You can't have 2 showers being fed from a combi boiler, one must be mains fed electric

 

Astonishingly lack of specifications available for the Grohe - I can't find flow rates even on their own website.

Having said that, it does appear to be a very good set, and I don't believe you'll have flow issues at all.

I think where the Mira Excel would win out on its super-dooper flow is on gravity-fed systems as it'll seemingly handle very low supply pressures, right down to 0.1bar, I think.

But that simply ain't an issue for you with your mains-powered combi, so I would go with Grohe (hey - an advertising jingle...) in your position.

Perhaps also consider the Mira Agile ERD if you want a dual-head thingy? A bit more at £250 each, but looks nice . Or one Agile and one Grohe...

 

who says? got 4 running off mine and it will run two at full chat without problem.......

don't get the bit about electric shower either, what regulations govern that?

 

Got 2 mira excells here running of a Vaillant combi, can't fault them, not had a Grohe but friends do and are happy.

 

What type of combi boiler do you have?!

In general, you cannot successfully run two showers from a single combi boiler.

 

They are both good makes and shouldn't have any issues.

The Mira Excel seems like a real top-of-the-range item, but I think it'll only prove itself worthwhile when you have low pressure situations - which do not apply to combis.

 

grant 36. however i agree with you, need to be the right boiler to run 2 at the same time.

still don't know which regulation says you MUST have an electric shower. It might be recommended but it is not a "must" to me

 

I wonder what system is being pulled out? Done a rewire recently on a 4 bed 2 bathroom house and the so called plumber persuaded the customer to rip out an unvented cylinder and install a combi...Couldn't understand it my self.

 

I suspect strongly that G&W meant that to successfully run two showers at the same time from yer standard combi, one 'must' have to be instant electric.

You are running two showers simultaneously from a 36kW jobbie? That's reassuring. I'm guessing your mains water supply must be pretty good?!

In any case, this isn't an issue for the OP Basha as he says there will only be one shower run at a time.

 

Should clarify my earlier post.
Although i have 2 x mira excels on a combie, i wouldn't run both at the same time as the flow does drop considerably.

 

Actually mains pressure is ok but flow is awful. So we have a seperate 3 bar booster with 200ltr tank. So the booster copes it will deliver 30l per minute.... Drives two showers ok.

You make an interesting point, it is not the combi that is the critical issue but mains flow rate. A combi and electric together will not help if mains flow is poor.

 

So you have a 36kW boiler AND a pumped supply?! Jeepers, no wonder you can run two showers simultaneously!

That ain't the same as running two showers of a single combi, man .

The reason why a combi and an electric shower is more valid is because the leccy shower uses very little water compared to a combi shower, so it would be like having a combi shower and a cold tap running partially open. In most cases you could have both running side-by-side.

But two showers direct off a combi? Only a very limited number of combis - coupled with an excellent mains supply - can do this.

 

It's basic maths

14ltr hot water from combi

2 x 8ltr showers = no water,

Oi!!! I'm having a shower who's running the tap downstairs!!!!

That's why

 

It is always useful to have an alternative available. If your combi goes t***s up, an electric shower still enables you to wash.