Weil-mclain 633-600-001 Aqua Plus 45 39.9 Gallon Indirect-fired Water Heater Stainless Steel Series 2

Product Description

The WEIL-MCLAIN 633-600-001 Aqua Plus 45 is a 39.9-gallon indirect-fired water heater built for residential and light commercial hydronic heating systems. It pairs with a boiler to deliver consistent, high-output domestic hot water. The tank and coil are both constructed from 316L stainless steel, a grade known for its resistance to corrosion, scaling, and pitting. This makes the unit well-suited for areas with aggressive water chemistry. Because the tank is fully passivated and welded, no anode rod is required. That eliminates a routine maintenance task that plumbers and HVAC technicians often deal with in standard tank-style water heaters. The high-output heat exchanger transfers heat efficiently from the boiler loop to the domestic water supply. This design allows the unit to recover quickly, supporting households or facilities with moderate to high hot water demand. A maximum flow rate of 8 GPM supports simultaneous draws from multiple fixtures. The Aqua Plus 45 includes an advanced digital control that allows installers and service technicians to set and monitor temperature accurately. The tank operates at a working pressure of 150 PSI, and a 150 PSI temperature and pressure relief valve is included from the factory. The unit also ships with a drain tapping and valve, leveling legs, and poly resin top and bottom caps. Two inches of CFC-free foam insulation surrounds the tank to reduce standby heat loss. At 46-1/4 inches tall, the unit fits in most mechanical rooms. The tank capacity is rated at 42 gallons. Shipping weight is 111 pounds. This Series 2 model carries a limited lifetime residential warranty, making it a dependable long-term choice for hydronic system installations.

• 316L stainless steel tank and coil — no anode rod required, corrosion-resistant construction
• High-output heat exchanger with up to 8 GPM max flow rate for fast hot water recovery
• Includes TP relief valve, drain valve, leveling legs, and 2 inches of CFC-free foam insulation

Product Highlights

The Weil-McLain 633-600-001 Aqua Plus 45 delivers reliable indirect-fired hot water with a fully welded 316L stainless steel design, advanced digital control, and a limited lifetime residential warranty. It is a strong choice for hydronic heating professionals installing or replacing indirect water heaters in residential applications.

Product Information

Standard Information

• Brand: WEIL-MCLAIN
• Manufacturer Part Number: 633-600-001

Technical Specifications

• Series: Aqua-Plus
• Item Type: Indirect-Fired Water Heater
• Tank Material: 316L Stainless Steel
• Storage Capacity: 39.9 gallons
• Tank Capacity: 42 gallons
• Height: 46-1/4 inches
• Working Pressure: 150 PSI
• Max Flow Rate: 8 GPM
• Insulation: 2 inches CFC-free foam
• Weight: 111 pounds
• UPC / GTIN: 672619207653