Now then. Having tried lots of different heaters over 10 years, this is my latest strategy, and it is working well so far!
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I bought this because:
(i) I became frustrated with the poor operation of the thermostats on all the fan heaters I've tried (about 5). I was getting too hot before they turned off, and too cold before they come back on.
And
(ii) As I sleep upstairs, it's a long trek downstairs to switch any heater on if I'm looking for a quick blast before starting breakfast.
If it's not obvious, the item on your right goes in your socket (check you have space...you may need to make a tiny extension lead, and to take you from 2 pin to 3 pin). It then links remotely with the controller on the left. This becomes the on/off switch for the socket, which I take upstairs with me.
The controller is also a thermostat, which operates with a 1 degree tolerance of the chosen temperature. ie it switches your socket on (and hence your fan heater on) as soon as the temperature drops 1 degree below the set temperature. (On at 19, off at 20 as shown). By switching it to Fahrenheit, it operates to within 1 degree F.
The added advantage is that you can place the thermostat at head-level, which seems better than relying on the heaters own 'stat at floor level.
The set cost me £20 delivered. At the time of writing, available here:
http://www.ebay.co.uk/itm/201222139628
Build quality is 'functional', but operation seems really good. It checks the temp every 30 seconds (and flashes a bright green LED which I've painted out as it lit-up the whole van!).
As Spring advances (!), I switch to a small panel heater (silent), which also works with the device, as will those oil filled radiators - although I've never got the van hot enough to need one of those turning off......