Wagner & Co.’s line of SECUSOL systems is designed as standalone appliances for domestic hot water preparation. Backed by an electrical heating element, the appliances can be used to immediately retrofit existing DHW heaters. Installation time for a typical SECUSOL, including collector mounting, is reduced to four to six hours. SECUSOL is a non-pressurized hybrid drainback appliance. The drainback design allows for the solar loop fluid to drain directly back into the heat exchange coil, thus eliminating the need for a separate drainback tank to be installed..