Weil-McLain Aqua Plus 45 Indirect-Fired Water Heater (Series 2)
Weil-McLain Aqua Plus 45 Indirect-Fired Water Heater (Series 2)
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Apply for Trade Account & Terms →| Manufacturer Part Number (MPN) | 633600001 (Legacy: 633500001) |
| Storage Volume / Tank Capacity | 39.9 Gallons (Domestic side) |
| Max Firing BTU Input Rate | 190,000 BTU/hr |
| Boiler / Water Connection Ports | 1" NPT Boiler Loop / 3/4" NPT Domestic Water |
| Maximum Rated Working Pressure | 150 PSI (Tank) / 145 PSI (Coil) |
The Weil-McLain Aqua Plus 45 Indirect-Fired Water Heater (Series 2) is a high-performance system component engineered to deliver premium domestic hot water efficiency and reliability. Built with a heavy-duty 316L stainless steel tank and high-output internal coil design, this unit provides exceptional durability and outstanding resistance to demanding, aggressive water environments. Its low-maintenance, high-performance architecture eliminates the need for a sacrificial anode rod, making it an ideal solution for residential and light commercial hydronic heating loops.
Operating seamlessly as an independent zone connected directly to your primary heating boiler, the Aqua Plus 45 generates ultra-fast recovery times and continuous hot water delivery by utilizing a tightly wound 1-inch diameter heat exchanger coil. The tank features a high-density, 2-inch thick CFC-free foam insulation jacket that reduces standby heat losses down to an exceptional 0.4°F per hour, maximizing overall fuel conservation. Encased in a resilient, dent-resistant pewter gray polymer resin outer shell, this indirect water heater provides long-lasting mechanical protection and reliable domestic thermal staging.
Advanced Engineering Features:
- Premium 316L Stainless Steel Architecture: Advanced plasma and TIG-welded tank geometry provides total corrosion defense across harsh water applications without sacrificial rods.
- High-Output 1" Internal Coil: Generates excellent first-hour flow delivery with a remarkably low pressure drop on the boiler-side distribution loop.
- Integrated Digital Thermostat: Features a factory-installed precision immersion sensor probe for simple, rapid low-voltage control panel wiring.
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