Stiebel Eltron. A trio of one-, two-, or three-collector SolKit solar water heating packages are available to meet the needs of most households. The SRCC-labeled ceramic/metal-coated collectors feature anodized aluminum enclosures and low-iron tempered glazing for optimum performance and long service life. The 80- and 108-gallon tanks have dual heat exchangers and are wrapped in 3 inches of insulation for very low standby heat losses. Each package comes complete with collector, pump, and controller, but piping is not included. 800.582.8423.