M
Mike Jackson
The water in the hot water cylinder (It's a cylinder not a tank) has nothing to do with the Y plan. The Y plan is the set of controls that enable the boiler to heat up the water in the cylinder (yes cylinder not tank). This y plan requires a pump to work. This is known as the primary side.
Delivery of hot water does not require a pump but this is not what you asked. You asked if a y plan needed a pump, and it does.
P.S. it's not a tank in the loft it's a cold water storage cistern and it doesn't push the water out of the top of the cylinder. It's the head of water in the cistern that generates a force that pushes the water out of the top of the cylinder.
P.P.S my A level in physics trumps your GCSE.
Delivery of hot water does not require a pump but this is not what you asked. You asked if a y plan needed a pump, and it does.
P.S. it's not a tank in the loft it's a cold water storage cistern and it doesn't push the water out of the top of the cylinder. It's the head of water in the cistern that generates a force that pushes the water out of the top of the cylinder.
P.P.S my A level in physics trumps your GCSE.