Ticket ref GG-TK-110600 remains open as the physical boiler install that commenced on 9/12/2022 still does not provide hot water to the cylinder tank when HW demand is presented from the controller/wiring control centre. Initially, before the installer's second visit to investigate on 22/12, the boiler would intermittently come on and we had constant very hot water. Fortunately, since 22/12, the wiring has left the HW valve open but the only way now to have heated hot water in the cylinder is to have the heating on which presents 2 issues. 1. £££unnecessary heating of house just for hot water so often having cold showers before, during and after Christmas. 2. HW in cylinder could get too hot without a mechanism to stop the flow of the heated water to the cylinder tank when the heating is on. Issue #2 has been more relevant following my daughter's diagnosis of Pneumonia just before Christmas. I'm still waiting to be contacted and have been waiting for a promised electrician since 22/12/2022 following the second visit by the installer who confirmed is not qualified to diagnose the wiring issues caused by the install. The old boiler worked when required (hot water and heating) but was replaced as it kept cutting out when the heating was on. I know it has been Christmas but it has been almost a month since the install and it's still not installed properly as the system is rendered manual with additional cost overheads to unnecessarily heat radiators at the same time. Not a great advert for reducing emissions from fossil fuel usage, not to mention my gas bill. I called again yesterday and was promised contact to confirm when the electrician will be here but am yet to receive this. I will be seeking compensation if the situation is not fully resolved by end of 6/1/2023.