Digital pumped shower hot water connection

[obiwanzamora]

Hi all,

I'm looking into installing a pumped digital mixer shower and quite like the look of the Aqualisa Quartz Digital Pumped Thermostatic Exposed Shower. I've read through the installation instructions and the diagram (see attached image) seems to suggest that the hot water supply is simply tee'd off the existing outlet from the hot water cylinder. Having looked through some of the previous posts I can see most on here recommend using an Essex or Surrey flange when a pump is involved. I am curious why there is no mention of this in the installation instructions, is there a reason in this case why just tee'ing off the existing outlet is ok?

Thanks

 

[Rob]

Can't imagine its particularly powerful. Which would explain why you can get away without flanges.

 

[bathjobby]

Can't imagine......

....... that plus not wanting to follow the installation instructions hardly seem a sound basis on which to proceed to do something different !
This model is designed to work with negative Head; gives out 13ltrs per min standard increasing to 18ltrs per min when Boost is used; all by following the installation instructions. Surely any query with those would be best directed to the company.

 

[Phill Peck]

Different pump manufacturers recommend different methods. Go with whatever method they recommend

 

[cocjh1]

I'm about to plumb in an Aqualisa Quartz Digital Exposed myself and pondered the same. Read lots of conflicting experiences with regards flanges in general, especially Surrey, so I'm sticking to what Aqualisa recommend and tee straight off the horizontal output, downwards, and then up to loft space.

Great thread on screwfix for an OP slating:
http://community.screwfix.com/threads/advice-on-fittings-for-grundfos-22mm-surrey-flange.88612/

 

[longdogs]

Don't know if this will help or confuse:

I fitted one of those about six years ago with no flange, just tee'd off the hot supply where it comes out of the cylinder, at a 45 degree angle in 22mm. Control box is in the loft, just below the tank.

I see the customer regularly and he has never complained of having any problems with it. He is also very happy with the power.

A lot of manufacturers now state that if you don't fit a flange, it invalidates the guarantee. Not sure about Aqualisa these days.

I have fitted many shower pumps without flanges and never had a problem.

Recently fitted one to an existing flange and air is constantly sucked in.

So, who knows??

 

[obiwanzamora]

Thanks to everyone who posted. I completed the installation this weekend, in the I opted against using a flange as it was not mentioned in the installation instructions. I just tee'd of the existing hot water pipe (position 'B' in the diagram).

I'm very pleased with the results the shower is excellent. I have learnt a lot from my first foray into DIY plumbing.

 

[longdogs]

Thanks for the update. It's nice to get some feedback now and then.