hi julian, it is working fine,apart from the needle valve getting blocked on unfiltered WMO. have been using kero. it is very controllable. can go from a nice background heat to a roaring red hot monster in a couple of minutes. once i sort out the best way to filter the oil i should be able to run totally on WMO. will be doing some experiments over the summer with different filter arrangements. i an thinking of large scale hot water storage using the m67 and a insulated IBC. heat exchanger and radiator with a fan. of course that is more things to go wrong so wont be abandoning the drip feed heater. could do with some air con at the moment. think i will go and sit in the car,be a bit cooler there although i will have to use some devils pee. don't tell anyone.