I think earlier on in production there was something going around about the thermal well but a distributor would have to give the details. Also Jerry - cu- a member on here I think owns or owned one. Maybe he will chime in.
I have owned a 370ss for six months and so far so good. One of there selling points is they take up much less room in your truck/van, yet get the same performance as the bigger units from competitors.
I hated mine. Had lots of little problems . CMS kept it running for me and got it running right . I had one of the early units and it put me off buying sapphire . Far as I know the newer models have all the bugs worked out.