They did 1 project for us : installed exhaust pipe and few years later upgraded it to a different product.
A while ago we changed from hot water tank to instant hot water tankless system. Big Valley Heating installed new exhaust pipe for the system. Did pretty good job at that time. All to the code for 2009 requirements.
Few years later we did some renovations to our house and city inspector noticed the installed exhaust pipe was not matching the code for 2013 and requested to replace it. Big Valley Heating came within 3 days and replaced it at no cost to us (except labour charge).
Every year we have somebody to come and inspect and maintain our hot water heating system boiler. Usually the fees for inspection are relatively low, but almost always they find something broken and replace it for big $$. This year we decided to call Big Valley. They charge a bit more, but! But they found there was nothing wrong with our system, but it was not properly maintained all these years - there was huge accumulation of dust, debris, etc. Nobody bothered to clean it despite charging us for "maintenance". I guess they were making huge money by charging us for replacing "broken" parts.
Big Valley guy cleaned our system thoroughly, reassured us that all is in perfect working order. I am going to call them again next year. Good job, guys!