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Pump to be sized to maintain circulationloop temperature.The pump should be sized to overcome thepressure loss through the tank water heater, and supply and return plumbing in thecirculation loop. Reference the sectionPump Sizing for Circulation.Pump to be of bronze or stainless construction. TanklessEquipment List QTY Tankless 2 Water HeatersElectronic Connection ** Refer to Tankless Accessories and Model Applicability for electronic connection details. Drawing Number: WH-2-RGE Domestic Hot Water - Circulation Systems2 Tankless Water Heaters with Gas or Electric TankPreferred Piping Installation Drawing Date: February 27, 2008 This is not an engineering drawing; it notas a replacement for professional engineering This drawing is not intended to describe It is up to thecontractor or engineer to determine andconfiguration of the particular The drawing doesnot imply compliance with It is theresponsibility of the engineer isin accordance with Confer with local buildingofficials before installation. Key Pressure Relief Valve 3/ 4" Ball Valve3/ 4" UnionCheck Valve S Pressure RegulatorCirculating PumpSolenoid Valve Boiler Drain Valve 21 Gas Supply Line TanklessWater HeaterPrimary TanklessWater HeaterSub 1 (Optio nal) 2- 10 GallonStorage Tank(To eliminate cold watersandwich e ect caused byfrequent On/ O operation) Expansion Tank Minimum 3/4 “ Cold Water Supply Line Minimum 3/4 “ Hot Water Supply Line Building Outlets For this application:Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer. Pump to be sized to maintain circulationloop temperature.A minimum of 3 GPM flow is recommended for the circulation system.The pump should be sized to overcome thepressure loss through the Tankless waterheater, optional storage tank, and supply and return plumbing in the circulation loop.Reference the section Pump Sizing forCirculation.Pump to be of bronze or stainless construction. Aquastat Connection TanklessEquipment List QTY Tankless 2 Water HeatersElectronic Connection ** Refer to Tankless Accessories and Model Applicability for electronic connection details. Drawing Number:WH-2-R Domestic Hot Water - Circulation Systems2 Tankless Water HeatersOptional Piping Installation Drawing Date: February 27, 2008 This is not an engineering drawing; it notas a replacement for professional engineering This drawing is not intended to describe It is up to thecontractor or engineer to determine andconfiguration of the particular The drawing doesnot imply compliance with It is theresponsibility of the engineer isin accordance with Confer with local buildingofficials before installation. Key Pressure Relief Valve 3/ 4" Ball Valve3/ 4" UnionCheck Valve S Pressure RegulatorCirculating PumpSolenoid Valve Boiler Drain Valve 22 TanklessWater HeaterTanklessWater Heater Gas Supply TanklessWater HeaterPrimary Sub 1 Cold Water Supply Line Hot Water Supply Line Smaller Return LineCan Be Used AfterThe Last Fixture Expansion Tank Sub 2 (Optional) Header Sized On...

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