Not sure it's relevant, but no. I would only fit a combi boiler in exceptional circs, Chinese or otherwise. I think combis are a bad idea unless unavoidable. I might fit a Chinese heat-only boiler, if after some investigation it looked OK (that's in my own property, I'm retired and didn't work as a heating engineer). But it's harder to change a boiler than it is a failed multimeter.Would you fit a £2-300 Chinese combi boiler?