Introducing a new line of high-performance commercial electric water heaters from GSW John Wood. The John Wood Signature Series is an advanced line of commercial water heaters with the features contractors and engineers have asked for. Custom-built-to-order in three sizes: 50, 80 and 119 US gallons and inputs from 6 to 54 KW. Surface or immersion thermostat for automatic temperature control. ASME models available in 119 US gallon units.