Do I need a pump?
Historically, British water systems are generally connected to a cold water storage tank which is kept in the loft. These are known as gravity fed systems which are low pressure, and rely on height of the tank to provide the water flow pressure for the house. Due to height restrictions imposed on where the tank can go, low pressure is a resulting factor (can be as low as 0.1 bar)
For those who prefer shower performance, it is necessary to pump a gravity fed system, or install a high pressure boiler or unvented system.
NOTE: Only low pressure gravity fed systems can be pumped, check with your installer that the cold water storage tank and hot water cylinder is big enough (the hot water may run out). The standard UK domestic tank is 225 litres, (this should be sufficient) but for larger homes a 450 litre tank is recommended. An 120 litre cylinder for hot water should be sufficient, but a larger home may require an 166 litre cylinder. Pumps must be fitted in accordance with current Water Regulations, and not be connected to the water mains, either directly or indirectly via a mains fed water heater
Where will the pump be fitted?
The pumps work by pushing water rather than pulling it, and are situated as close to the water supply as possible. Therefore, they are commonly fitted close to the hot water cylinder in the airing cupboard.