Weil-mclain AQUAPLUS55 Indirect Water Heater 55 Gallon

Product Description

The WEIL-MCLAIN AQUAPLUS55 is a 55-gallon indirect-fired water heater from the Aqua-Plus Series 2 line, engineered to produce domestic hot water by drawing heat from an existing hydronic boiler system. At the core of the unit is an internal stainless-steel heat exchanger that transfers heat from the boiler loop to the stored potable water without mixing the two fluid circuits. This design leverages the efficiency of the connected boiler rather than a dedicated burner, making it a common choice in residential and light-commercial hydronic heating installations where a boiler is already present.

The AQUAPLUS55 is suited for residential and light-commercial applications where a hydronic boiler serves as the primary heat source. It is typically installed alongside a dedicated indirect water heater zone on the boiler, allowing the boiler to prioritize domestic hot water demand when needed. The pewter finish integrates cleanly into mechanical room installations. Plumbing and HVAC contractors handling boiler-based systems are the primary trades responsible for specifying and installing this unit.

Key Features

• 55-gallon storage capacity for high domestic hot water demand applications
• Internal stainless-steel heat exchanger for durable, corrosion-resistant heat transfer
• Indirect-fired design uses the existing boiler as the heat source, eliminating a separate burner
• Series 2 design from the Aqua-Plus product line
• Pewter finish suited for standard mechanical room installations

Compatibility

Designed as an OEM-style indirect water heater for use with hydronic boiler systems capable of supplying a dedicated indirect water heater zone.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician familiar with hydronic heating systems and local plumbing codes. Shut down and isolate the boiler loop before making any connections to the heat exchanger circuit. A temperature and pressure relief valve must be installed per local code requirements and IFGC or IPC guidelines. Verify that the boiler output capacity is sufficient to serve both space heating and indirect water heater zones before commissioning.