This morning we received an informative email from blog readers Anne & Colin (nb Heather Ray) advising they have previously purchased plug-in thermostats from B&Q and that they were less than the £35 I quoted. A quick trip to the B&Q website confirmed it was possible to purchase a suitable thermostat for £19.38 (plus p&h).
The thermostat plugs into the 240v wall socket and the heater then plugs into the thermostat. The thermostat then controls the activation of the heater based on the configured room temperature.
Now I need to do a cost benefit analysis to see if the cost of the thermostat will be recovered by the saving in electricity. The first factor to consider/establish is the cost of a unit of electricity. that’s very simple to do as all the energy companies provide their tariff information in a clear, concise and simple format [cough… splutter] Liar..Liar… Your pants are on fire!! OK, it’s not that easy. Using superior logic and ancillary evidence. I guessed a unit of electricity costs approximately 15p which would mean the thermostat is worth slightly more than 129 units of electricity. So we would have to save at least that much electricity to make the purchase financially worthwhile.
Assume we would run a 1kw fan heater 16 hour daily for the full four months over winter.
16hrs x 124days = 1984 units
Required saving in use of the heater is 129 ÷ 1984 = 7%
In order to ‘break even over winter the thermostat would need to ensure the heater was switched off for 7% of the total time thereby avoiding overheating of the boat and wasting electricity. Actually my preference would be to leave the heater running 24/7, but set the thermostat to a lower temperature during the periods we are asleep or not aboard. My logic is; it’s more energy efficient to slightly alter the temperature rather than move the temperature from one extreme (very cold) to another (comfortable).
Assuming my electricity consumption calculations are correct and the price of 15p is right, then we should consume approximately £280 of electricity over winter in heating the boat.
My estimated diesel consumption running the Lockgate refleks is 200-300mls/hr and the cost of domestic diesel was 80p/ltr. The estimated cost of running the Lockgate is approximately 16p/hr @ 200mls and 24p/hr @300mls. Just to check, I’ve been to the Lockgate website to view their diesel consumption figures. They state min 180mls and max 540mls. We’ve been running the Lockgate just below the lowest setting so it’s probably using 180mls/hr which equates to 14p/hr. This means it’s almost equal to my estimated cost of a unit of electricity. There is one other consideration. The Lockgate appears to emit more heat on a minimal setting than a 1kw electric fan heater. It probably emits too much heat…. despite being on the lowest setting!
So is it to be electric heating or diesel? Maybe a combination!
Jan here…. Yawn!