Hiya new to forums so sorry if the wrong place. I'm currently planning a thermal store installation for a new property being converted into a hmo . I would like to zone every single bedroom and give the teanants a switch (like a light switch) which is also run into a tamper proof thermostat set to around 22.5degreec. Is there any products which act as a timer when received a switch live will start to count, which I can take from the thermostat, to monitor the use of each individual's heating usage in hours . So every month the landlord will be able to see the following Room 1 : 13.4 hours Room 2 : 7.1 hours Room 3 : 2.5 hours So on and so forth. Thanks in advance .