I want to fill a sealed central heating system with water at a welsh cottage my partner owns. There is no mains water supply. the water supply at present is supplied via a series of water tanks collecting fresh water, which is filtered and used for the unvented tank to supply a trickle of hot water and cold water for the ground floor loos. A pump will be installed eventually.
In the meantime I would like to fill the central heating system with water, but at present the current water supply is far too low to pressurise the system.
The system is tiny, consisting of four small radiators on a microbore system.
Is there a way I can manually fill the system with water and pressurise it?