Terrible experience. Avoid.
Before a home purchase, we had them come out and do an inspection on an expansion tank that our inspector said was faulty. Knauer insisted that it was fine. They even signed on the company letterhead that the expansion tank was OK.
One week later it turned out that the expansion tank was NOT OK, and needed to be replaced!! They said that it would cost less than $500 to replace it, but once they sent us their quote, they wanted $1130!
I wish I had never dealt with Knauer. They don't stand by their word, and their customer service is a joke. Their answer to my complaint was ""sue me.""