new here just saying hi and a question

hi all, i am in the UK and live in a bus. i am using a spike type WMO burner at the moment running on red diesel. works fine. i used to burn wood but stopped a couple of winters ago due to the hassle of of getting good quality wood and smoke issues. i have been reading a lot about rocket mass heaters and fancy having a go at making one. i cant seem to find any flue pipe that is smooth. i know the corrugated SS stuff doesn't work from what i have read. i did find this.

http://www.ebay.co.uk/itm/Galvanised-steel-spiral-ducting-2off-budget-priced-flue-pipe-x-1-5mtr-long-/400658751070?pt=UK_Home_Garden_Hearing_Cooling_Air&var=&hash=item5d491f5e5e

not sure how smooth it is on the inside , but as it used for ventilation i assume it will be fairly smooth for the same reasons that we need it smooth for. anyone used this stuff?

sorry for cross posting on donkeys site as well for those who have already read this post.

bob cornwall uk

I would look for a local scrap yard. Better material at a better price.

always my first option. unfortunately the nearest one is 30 mile round trip, and they don't ever have a lot of stuff anyway mainly cars and farmers cast offs. you know farmers if they throw it away it really is scrap. there are couple of other yards but they are even further away. by the time i have driven around looking for pipe i will have spent more than buying new. when i lived in town i was down the scrapyard 3 times a week. the price of living in the country.