cold water tank connections

[bobjayes]

I've a cold water tank in a loft coversion feeding a hotwater tank and shower pump for an en suite. I've just discovered the pump and hotwater tank should have thier own 22mm cold feed. Because of space restrictions where the tank is fitted is it possible to fit the second outlet on the underside of the palstic cold water tank rather than the side. Also is there a reason why one outlet is always shown at least 25mm above the lower one.
Many thanks
Bob

 

[ecowarm]

I've a cold water tank in a loft coversion feeding a hotwater tank and shower pump for an en suite. I've just discovered the pump and hotwater tank should have thier own 22mm cold feed. Because of space restrictions where the tank is fitted is it possible to fit the second outlet on the underside of the palstic cold water tank rather than the side. Also is there a reason why one outlet is always shown at least 25mm above the lower one.
Many thanks
Bob

Its so the hot water runs out before the cold to prevent scolding

 

[bobjayes]

many thanks for the prompt response, very impressed. Would you know if there is any reason why I cannot make the cold water outlet from the plastic tank from underside rather than the side as the instructions show. The tank is new and complies with the new bylaw with covers etc,
Regards Bob

 

[tamz]

You can come off the bottom but use extended tank connectors such as these.
EXTENDED MALE STRAIGHT CONNECTOR WITH BACK NUT 302B (S302B) - IBP Conex UK
This is to keep the silt and muck that gathers on the bottom of the tank from being drawn in to the system.

 

[kirkgas]

MI for plastic tanks tell you the tank needs to be on a flat base, so cutting fittings into the base will require a larger hole to be cut in the base which can cause the tank to distort, also i'm sure it states in water regs that draw offs should be on the side

 

[bobjayes]

many thanks, really impressed

 

[Phil]

A good tip is to use the 'ring main' method, two 28mm tank connectors joined by a loop of 28mm pipe the same shape as a grab handle. Then 22mm draw offs via 28x28x22 tee's to feed cylinder, taps, cold to shower etc.

The loop will be constantly fed by the two 28mm pipes and be more than enough to meet demand.

I know this doesn't help you though!

 

[Gray0689]

Phill that sounds a total waste of time

 

[Phil]

Apparantly its a new recognised way of doing it, I saw it in a free plumbing mag.

 

[Gray0689]

Apparantly its a new recognised way of doing it, I saw it in a free plumbing mag.

I don't see the point 2 22mm will do the best

 

[tamz]

Apparantly its a new recognised way of doing it, I saw it in a free plumbing mag.

Don't believe everything you read. Sounds like a load of pysh to me

 

[bobjayes]

Thanks guys for the responses. The tank is 1400mm long and supported on a flat base with only about 75mm of one end open. It was into this section I was planning to fit the second draw off point which is to feed the cold inlet of the shower. Given your comment however I'll also fit additional support in this tank area.
thanks Bob

 

[Phil]

Hey don't shoot the messenger, others on here will have seen it. I'm sure it was in Plumber & Heating Installer.

 

[tamz]

Hey don't shoot the messenger, others on here will have seen it. I'm sure it was in Plumber & Heating Installer.

No problem Phil

 

[Phil]

Yeah, I can't rememner where I saw it but I'm sure it had WRAS approval and was the new recommended way of dealing with multiple draw offs from a tank.

I imagine you would keep the cylinder cold feed on a seperate tank connector above the ring main though.

 

[kirkgas]

Yeah, I can't rememner where I saw it but I'm sure it had WRAS approval and was the new recommended way of dealing with multiple draw offs from a tank.

I imagine you would keep the cylinder cold feed on a seperate tank connector above the ring main though.

the cylinder connection MUST be on an independant supply, in flats where cold storage is piped in one supply (sometimes 32mm or 28mm) each cylinder has its own supply, its to do with preventing the cylinders imploding and or overheating through supply and or vent being
interupted