I've had my EZ for 5 years now. I did replace the heat exchanger last year. Other than that, I replaced one Coupler to the blower. I know there are quite a few I've seen post that also own EZ's. The most powerful of the bunch, I helped install a couple months ago...3 Cyl Kubota with a 56 blower...what a beast. It had a monster coupler between the Engine and Blower...