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Interesting comment on the discussion via the previous link from robmac ... the heaters not destined for Europe originally wouldn't pass the tests that would allow them to be CE marked - so the eBay jobs suitability would be suspect. And when sold in UK by PlanarUK (think that is the company?) after suitable mods to gain CE approval, the price benefit is (IMO) severely erroded.
That is how I am reading it anyway. Looks like more money heading to PF Jones for a D2 Airtronic.
Is that what the thread linked to by Robmac says?
I thought otherwise and can't find any mention of modifications to meet CE standards. It costs a lot of money to have such items tested and certificated so it is quite possible that the Chinese makers simply have not bothered to invest in that. On the whole I thought that link contained comments both for and against the cheap Chinese heaters and would not put me off.