Rheem. SolPak solar water heating systems are now available with options of tankless gas or the maker’s Marathon storage tanks. The additions allow contractors to tailor their product selection to any gas or electric project. SolPak systems are designed to provide up to 80% of a home’s hot water depending on the region, with tankless gas or Marathon tank water heaters making up the difference. SolPak systems with either the tank or tankless option qualify for federal tax credits of 30% of the installed cost through 2016. Marathon units also comply with the Buy American provision of ARRA. 866.720.2076. www.rheem.com.