Shower pump on ceiling

[acmedone]

I posted on the electrics side about fitting a shower pump on the airing cupboard ceiling.

At risk of tarnishing the Electrics forum with filthy plumbing advice, the pump should be close to the cylinder, on the floor for best results. and in strict accordance with the instructions to validate the warranty. Otherwise additional air vents, anti-gravity loops and negative head pumps become necessary. Apologies if you already considered this.

The pump will have at least 2 foot of positive head (and no pipe work will extend up into a negative region) so I don't believe a negative head pump is necessary. But additional air vents, anti-gravity loops? Explanations welcome.

 

[echoes]

Have a read of this http://www.salamander-pumps.com/how-to/install-a-loft-pump.html

What you are proposing is similar to this diagram (if it's a twin impeller pump)

 

[acmedone]

Thanks for this. But I can't see the reason behind the "anti-gravity" loop. It's a bit of a sci-fi term; I'm sure a more meaningful name could be devised.

 

[echoes]

I agree, it is a bit Star Trek! But it's just to prevent hot water convecting up the pipework (along with air bubbles) to an idle pump.

I suppose it's a throwback ref. to 'gravity' circulation, where 'convection' circulation might be more accurate.

 

[acmedone]

I agree, it is a bit Star Trek! But it's just to prevent hot water convecting up the pipework

Gotcha

 

[acmedone]

In the end, the pipework worked out best by fitting the pump on a tray just above the HWC. I didn't add a separate flange from the HWC but vented the outlet before the pump take off.

The Bristan pump works nicely and has a volume control which I didn't expect.