Which pump is fitted to the pre-plumbed cylinder and what else is different on the system fit cylinder to justify the price difference ?

The pre-plumbed cylinders come with a Wilo PUMPWYPERP circulating pump fitted to the cylinder, the pre-plumbed cylinders also come with a second expansion vessel and a electronic programmable room thermostat including domestic hot water timer which are not included with the system-fit cylinders. A pre-plumbed cylinder is for use with a heat only boiler, also known as a regular, conventional or open vent boiler where as the system-fit cylinders are for use with a sytem boiler.
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