Please note, that a vital key to the installation is the existing electricity supply that you have. I called at 9.10am and by 9.55am there was an engineer with me who carried out the work whilst telling…”. Ashford 24hr plumber | local plumbers | plumber in ashford, maidstone, canterbury | plumbers in ashford, maidstone, canterbury | plumbers. Factory pre-wired for ease of installation. Hot water heaters.