A few years ago I bought a new heating system from...

A few years ago I bought a new heating system from Pronto. In the first couple-three years I had repeated issues with the system.
Pronto responded to all the issues I was having and serviced and corrected them as they arose and all were covered under warranty. But the problems continued and then the system itself went out of warranty while the problems--somewhat related to each other, somewhat not--continued.

It got to a point such that it started to feel that I had bought a heating system 'lemon'.

Fortunately, I had a convo with one of the business owners and laid out the 'lemon' case and he was receptive and accommodating and agreed to provide the repair service required for the latest issue at no cost to us despite the expired warranty.
I truly appreciated that. Also it seemed that this last repair was the cure all as I've been a couple of years now without further issue and the system is humming along all the time.
The message here isn't about potential lemons, that can happen with any infrastructure and any seller of same; the message is that these guys stepped up and took responsibility when they didn't need to so that one of their customers wasn't saddled with significant expenses and left with a bad taste in their mouth.
As a result, I even decided to sign up for a service plan with Pronto --happily so.
Bottom line: my experience is that if you have issues, they're treat you fairly.