I needed to replace a 50+ year oil burning boiler with natural gas in Westfield. I had a rep from Home Depot and Sears come out with their best estimates. I then had Bill out from Integrity and aside from his having the best price, he had the experience and ideas on what would work best for me. Instead of keeping system in same spot and going through my current flue; he put the system on a side of the basement wall and vented right outside with PVC. The other companies did not even offer this up. The systems others offered were 80 and 85% efficient while Integrity's was 98%....and it was still cheaper! Only drawback was no financing available but luckily I had enough in my 401k (all interest comes back to me). I would highly recommend Integrity, blew away the competition.