I am thinking of adding a pump to the 28mm gravity flow from a Potterton Profile 100E to the indirect Cylinder. The route is about 3m vertical and 6m horizontal. I have fitted 3C&E cable from the cyl to the boiler room ready for a cyl stat.
will the pump (when not spinning) obstruct the gravity flow enough, or will I need a zone valve as well? I have already bought a 28mm zone valve before I thought about adding the pump, but I am all for keeping it simple. The zone valve also has a switch (I have an idea it is the white wire) to prevent the boiler running when Cyl Stat is satisfied, unless CH is on.
The boiler flow goes to 22mm Up rads, 22mm Down rads and 28mm HW flow so I don't want to put on a 3-port valve as it would have to be huge and also I would have to reconfigure all those pipes
This is in my old mum's house who is short of cash and I think the current gravity HW is wasteful of energy (I have lagged the pipes wiuth Climaflex) as well as slow to heat the cyl.
will the pump (when not spinning) obstruct the gravity flow enough, or will I need a zone valve as well? I have already bought a 28mm zone valve before I thought about adding the pump, but I am all for keeping it simple. The zone valve also has a switch (I have an idea it is the white wire) to prevent the boiler running when Cyl Stat is satisfied, unless CH is on.
The boiler flow goes to 22mm Up rads, 22mm Down rads and 28mm HW flow so I don't want to put on a 3-port valve as it would have to be huge and also I would have to reconfigure all those pipes
This is in my old mum's house who is short of cash and I think the current gravity HW is wasteful of energy (I have lagged the pipes wiuth Climaflex) as well as slow to heat the cyl.