Half price, have just ordered one for my ‘toy hauler’ day/van build.
May be of help to someone else?

https://www.amazon.co.uk/gp/offer-listing/B004NDVO1O/ref=dp_olp_used?ie=UTF8&condition=used

Im also planning a builders van cum bike-transporter with sleeping van but presumed the hob would be gas. Whats so special about these?

you don’t have the hassle of building a vented gas cylinder locker if you use one of these.
They are used in boats quite often and are used by Outside Van in some their conversions;
https://www.outsidevan.com/

http://www.dometic.co.uk/product/dometic-origo-4100/

That’s the gist of it.

No gas bottles, no need for vented lockers, generally safer. You can put out a meths fire or clean up a spill with water.

Downsides, it’s not quite as refined as a gas stove, can’t just turn a dial and click the igniter (there’s a neoprene seal to take off the tank/burner before and replace after use) and the flame can be invisible in daylight.

…