Excellent service for the repair of autonomous heaters and the sale of extras. equipment. I bought an altex module and an IPCU relay from them to refine the preheater into an autonomous heater. We made the minimum price. After installation, it turned out that the module was defective. It was changed on the same day, installed and checked. Everything is OK. I recommend this service to everyone. In the near future I will apply for the purchase of a metering pump