Simple controller does just waht it says on the tin.

I have been using this controller on my Eco Angus Orligano 40Kw wood burning boiler.
The controller does quite a complicated thing well and simply. It keeps the boiler safe against overheat, and by adjusting the water temp you make it give full output or a more moderated slower burn.
Theres lots of things I'd like this to do that it doesn't do, but nonetheless it does the simple stuff simply and reliably.

There are not a lot of alternatives, but for a cheap controller this is not bad.