Reliable hot water, harnessed from the sun. The Hubbell Synergy Hydro SLN is our vertical storage solar powered water heater. An indirect model, SLN complements existing solar panels by transferring thermal energy to the domestic potable hot water system. High efficiency performance with 2” thick polyurethane foam insulation and built in heat trap. Copper fin tube design provides maximum heat transfer. Built to last with HydraStone™ cement-lined tank and copper silicon tappings that resist corrosion.