The heaters are in a flat that my father (93 years of age) rents.The owner had the heaters previously installed. I have on two occasions called your office for help and can only say the service is excellent and talked me through the set up procedure after the power had been inadvertently switched off . My only concern and this is a concern coming from myself as an electrical engineer of 40+years. WHY WOULD ANY ONE INSTALL THESE TO REPLACE STORAGE HEATERS. ECONOMY 7 ELECTRICAL SUPPLY IS CHEAP RATE ELECTRICITY USED AT NIGHT TO CHARGE THE HEATER BUT AS THESE ARE NOT STORAGE HEATERS YOU HAVE TO USE THE DAY RATE ELECTRICITY WHICH IS TWICE THE PRICE.I WOULD SUGGEST YOU ALSO HAVE A VERY GOOD SALES TEAM THAT HAVE TALKED THE LAY PERSON INTO REPLACING A PRODUCT(STORAGE HEATER)WITH A TECHNICALLY ADVANCED HEATER THAT WILL COST MUCH MORE TO RUN.