We have had 4 storage heaters installed prior to our moving into the property just over 3 years ago. They have operated erratically throughout this period. On any one night, any one or several of the heaters fail to charge entirely/charge minimally/charge well. We were using Economy 7 and now Octopus Go (4 hours). We realise we have reduced charging time but this is not the issue because we have extended the charge time in settings to 7 hours (3 hours on day time rate supply) with no benefit. My questions are: it seems unlikely that all four heaters have been faulty since installation (although they were badly installed and had to be emptied and the heating elements reset in the correct positions), so do you think this is a power supply issue? What happens if more power is called for than be supplied- would the power trip?). How does the heater communicate with the power supply and where within this system could a supply fault be occurring? We have had the heaters checked, several times, and no fault found. Current settings for all heaters is 22c, comfort setting on 8pm - 12pm, charging time set 12.30 to 4.30pm. So far this year we have done a factory reset several times, set temperature to 28 at 12pm along with our current settings (which worked well for about 2 months last winter - supply Octopus Go). Please help, any advice greatly appreciated. Today the living room heater was stone cold this morning - tomorrow who knows? We need something to come back to our landlord with because to date they have not been interested so long as their electrician okays the actual heaters - meaning we are on our own with this (e.g. the fault must be with us not the system) and it cant go on - husband is elderly and has a medical need for heat. Thank you for any help.