"I realize that you have numerous testimonials already but I wanted to provide you with another which I believe to be a worst case situation.
I spoke with you on the phone July 2014 after having my Colorado Cabin’s septic tank freeze up the previous 2 winters due to limited use and extremely cold temperatures. I purchased one of the septic heaters the following month and mounted it 3’ from the top of the tank (Septic tank is located under the porch). I connected to the bottom of the heater with a 90 degree elbow and insulated the additional 3’ run of 4” pvc and connected it through the top of the tank. It should be noted that the tank is buried extremely shallow due to bedrock limiting its depth. As instructed I connected it to power (30 amp receptacle for RV) for added insurance so as to not overload the circuit. The unit ran like a champ all winter and we were only able to utilize the cabin 3 weekends resulting in a perfectly functioning septic system.
Items to note are that the home is located at 9,000 feet with and average snowfall of 166”. However, the snow accumulation does not really start until after Mid December, so we have single digit or lower temperatures for 30-45 days prior to any snow cover. This, coupled with the shallow septic tank has all but assured a frozen tank each winter since it was built. I am glad to say that your heater worked flawlessly and we went the entire winter of 2014-2015 without any problems. Although the price seemed high at the time, it has been worth every penny for the peace of mind.
Thank you for your research to produce this product so that others can fix what seems like a never ending problem."