Is this possible?

[gasgas249uk]

My water heats from the imersion or AGA. No central heating.

Ive built a single storey extention and a 50 foot run from the imersion heater and cold storage tank.

Im aware that the flow in both pipes will be poor so want to fit a pump to supply a basin , loo and built in shower(not electric).All in ensuite.

Will one pump suffice? or will seperate ones be req for hot and cold?

Can you point me in the direction of a suitable model?

Thanks

 

[evilpiper]

One twin impeller pump would be fine. Best to have a dedicated cold supply from the tank and a dedicated hot supply from the cylinder#
One of these would be ideal as they are very reliable and the customer service is outstanding
http://www.stuart-turner.co.uk/products/monsoon/u30-bar-twin

#Hot supply from the cylinder needs to be piped as per the instructions in the pump manual to prevent air passing through the pump and damaging the impeller.

 

[muggles]

Also check your cylinder type before doing anything, if it's a direct one on gravity circulation fitting a pump might not be such a good idea

 

[gasgas249uk]

Thanks for the info,

Lets say the basin hot tap is on and the pump is pumping away.

Wont this put too much pressure on the CLOSED cold tap/pipes/pump/joints? causing a leak or damage?

 

[Agile]

Why should it?

Properly installed copper pipe and fittings can withstand 10 bar.

Tony

 

[kevplumb]

can the pump

 

[JohnD]

I wonder how much heat will be wasted running down 50ft of metal pipe, and letting it cool afterwards?

 

[Agile]

Very little heat loss as he is bound to have insulated it properly.

Tony

 

[JohnD]

what about the heat absorbed by 50ft of cold copper pipe? And the heat held by the water left inside it when he turns the tap off?

He has to fill the entire pipe with hot water before any comes out of the tap, and it will have been chilled by its journey.

I know someone who has 5 metres of iron pipe leading to the kitchen tap, and that takes a while to warm up.

 

[evilpiper]

Firstly the pump is operated by a flow switch, so that when you shut the tap and the water stops flowing the pump stops pumping. The pipes need to be well insulated.

 

[muggles]

For a run this long it'd be well worth considering fitting a secondary return

 

[kevplumb]

For a run this long it'd be well worth considering fitting a secondary return

agree

 

[evilpiper]

Im just wondering how to make a secondary return work what with having a 3 bar pump after the cylinder. Wouldn't it pressurize the water in the return pipe and keep overflowing itself into the tank? And as its a flow switch the pump would run constantly.

 

[kevplumb]

its only putting back what it takes out
you dont have a 3 bar pump on sec/circ

 

[evilpiper]

Not what i mean. Once the water from the cylinder is piped through the pump then everything after that point is pressurized. The secondary return connection would have to be after the last outlet in the extension to work properly and being after the pump would be at pump pressure thereby overpowering the gravity system operating the cylinder.