Most efficient electric heaters?

QrizB

Ok. Let's assume (against all logic) that it really does take 48kWh of heat to keep your annexe warm.

If you replace then1kW heaters with, say, 500W ones they will only be able to supply 24kWh a day.

Yes you will save money but the annexe will be cold and your guests unhappy.

mysteryUser

A potential idea could be to install smart relays & energy monitoring on the heaters. For example, having an electrician fit a 'Shelly 1PM' could be useful.

That would allow you to see exactly how much energy is being used and when, it also lets you remotely set schedules and remotely turn on / off etc. You could therefore easily ensure they're off when the area is unoccupied. 

They also allow for other things like countdown timers, so there could be a momentary switch at each heater which when pressed supplies power for a set time, like 3 hours. 

Smart tech could be used in other ways too, for example with PIRs and temperature sensors it could be setup so that when the area is unoccupied the heating is automatically restricted to a cooler set point. 

mark19851234

QrizB said:

Ok. Let's assume (against all logic) that it really does take 48kWh of heat to keep your annexe warm.

If you replace then1kW heaters with, say, 500W ones they will only be able to supply 24kWh a day.

Yes you will save money but the annexe will be cold and your guests unhappy.

Hi. I dont think it does take the radiators being on 10 24 hours a day to keep the annex warm. I believe they are setting them to 10 which is above the maximum temperature they are capable of heating the annex too. 

mark19851234

mysteryUser said:

A potential idea could be to install smart relays & energy monitoring on the heaters. For example, having an electrician fit a 'Shelly 1PM' could be useful.

That would allow you to see exactly how much energy is being used and when, it also lets you remotely set schedules and remotely turn on / off etc. You could therefore easily ensure they're off when the area is unoccupied. 

They also allow for other things like countdown timers, so there could be a momentary switch at each heater which when pressed supplies power for a set time, like 3 hours. 

Smart tech could be used in other ways too, for example with PIRs and temperature sensors it could be setup so that when the area is unoccupied the heating is automatically restricted to a cooler set point. 

Hi. Just looked up the shelly 1PM and this maybe exactly what we need. 

We have 2 heated electric towel rails like this in the property and they seem to generate way more heat than our electric heaters and only have a 400W element. Thats why we are thinking of at least swapper the 1KW heater for one of these as the bedroom warms up very easily.

QrizB

mark19851234 said:

QrizB said:

Ok. Let's assume (against all logic) that it really does take 48kWh of heat to keep your annexe warm.

If you replace then1kW heaters with, say, 500W ones they will only be able to supply 24kWh a day.

Yes you will save money but the annexe will be cold and your guests unhappy.

Hi. I dont think it does take the radiators being on 10 24 hours a day to keep the annex warm. I believe they are setting them to 10 which is above the maximum temperature they are capable of heating the annex too. 

In which case, the heaters aren't costing you £5/day and your whole argument falls down.

We have 2 heated electric towel rails like this in the property and they seem to generate way more heat than our electric heaters and only have a 400W element. Thats why we are thinking of at least swapper the 1KW heater for one of these as the bedroom warms up very easily.

There is no way for a 400W heated towel rail to produce more heat than a 1000W panel heater unless the panel heater is faulty.

QrizB

You have a 180 sq.m. annex. Good luck heating it with towel rails.

Aylesbury_Duck

mark19851234 said:

QrizB said:

Ok. Let's assume (against all logic) that it really does take 48kWh of heat to keep your annexe warm.

If you replace then1kW heaters with, say, 500W ones they will only be able to supply 24kWh a day.

Yes you will save money but the annexe will be cold and your guests unhappy.

Hi. I dont think it does take the radiators being on 10 24 hours a day to keep the annex warm. I believe they are setting them to 10 which is above the maximum temperature they are capable of heating the annex too. 

In which case, downsize the rads to the lowest kWh rated rads you can find, and hope that you don't get complaints or lose business if they're not big enough to keep the annex warm enough.

markin

Add 500w rads and lock the current ones in radiator boxes so they cant fiddle with them, or fit the Air-con as supplement heat, is it open plan apart from the bedroom?