Hot water pump - Tank Flange

[certain--death]

Hi,

I have a new indirect hot water cylinder to fit to replace a leaking cylinder. Our hot water pressure at the taps has always been horrendous and it's always been in my mind to fit a pump. Since I have the cylinder out I thought now might be as good a time as any to add a pump as well.

We have four sinks and a bath that are fed with hot water. Showers are electric so no requirements for them to have hot feeds. Cold water to all the sinks are mains fed so are already at pressure, so I will only need a single impeller pump.

My question is will I need a flange on the tank for the pump feed or can I use the secondary output that is on the side of the new tank (effectively an essex flange?) to feed the pump and then connect the top output from the tank solely to the vent pipe back into the cold storage tank?

Also any recommendation on particular pump brand? Originally I was thinking about a salamander but I've had a change of heart based on some of the reviews I've seen regarding reliability and lack of spares. Grundfos is a brand I've seen alot and I'm leaning towards one of their pumps now instead.

TIA

 

[Madrab]

Stuart Turner would be the only pump I would recommend.

If there is a secondary tapping that feeds directly from the side of the cylinder then yes it could be used to feed the pump, you just need to be careful that the cold water cistern can keep up with the demand to ensure the pump wouldn't be run dry if say several HW outlets were open at the same time. Yes the top connection could be used just as the vent.

You would also need to consider what type of taps you have - if they are monobloc/mix in the body taps then there could be a mis match in pressures between H&C and then possible flow/activation issues.