The Hydro-Quip HEATMAX series heater is the basic heater in a box unit. When all you need is heat, this is the most practical and user-friendly unit in the industry. The HEATMAX RHS is available in 5.5kW or 11kW models for new and existing applications. These heaters are suited for full 2" high flow free-standing application. Hydro-Quip is the industry's oldest and most trusted manufacturer because their heaters are easy to install and highly efficient. Make the smart choice and choose a heater from Hydro-Quip.