“I use this product to protect my Hot Water Circulating Pump (HWCP) which had to be replaced three times. I didn't know of the protective value of your product until checking it. Found it had broken down from too long a use, My son installed an outlet for a second one. They protected the HWCP, So, I decided to replace your product every four years, or to do that immediately if I heard a clatter from the HWCP. So, the two I bought recently are on standby when needed. Thanks for the help.”
