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Weil-McLain Aqua-Plus 45 Pewter Indirect Water Heater 633-500-001

Brand & Part #: Weil-McLain 633500001

Our SKU #: wei633500001

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Description For Weil-McLain 633500001

Helpful Information

Aqua-Plus Indirect Fired Water Heater


  • 316L stainless steel tank welded with "TIG and Plasma" technology coil tank. Higher tolerance against corrosion vs. carbon steel tanks
  • Temperature and pressure relief valve standard equipment
  • Higher output over 1" diameter 304L stainless steel heat exchanger with superior 1st hour rating and recovery. Large diameter heat exchanger allows for low pressure drop
  • Thermostat connection are already installed for quick and easy wiring
  • All connections including boiler supply and return, domestic water and domestic recirculation are on the side of the tank
  • Magnesium anode installed in all tanks
  • Inspection port on every tank is located near the bottom of the tank
  • Exceptional "R Value" with 2" dense foam insulation
  • Adjustable feet for uneven floors
  • Limited lifetime warranty on tank


BTU Input: 190000
Color: Pewter
Capacity (Gallons): 42 Gallon
Capacity (Domestic): 39.9 Gallons
Capacity (Boiler): 1.9 Gallons
DHW Operating Temp: 160°F
Recommended Flow Rate: 8 GPM
Head Loss-Boiler Side (ft.): 3.3'
Height (Inches): 46-1/4"
Diameter (Inches): 21-7/8"
Weight (lbs): 111 lbs
DHW Connection: 3/4" NPT
Boiler Connection: 1" NPT
Material: Stainless Steel
Working Pressure (Tank): 150 psi
Working Pressure (Coil): 145 psi
Warranty: Limited Lifetime for Tank Assembly/ 1-year Parts


Weil-McLain  Aqua-Plus 45 Pewter Indirect Water Heater 633-500-001

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Product Details

MPN 633500001
UPC 672619189010
brand Weil-McLain
Water Heater Type Indirect Water Heaters
Product Reviews for Weil-McLain Aqua-Plus 45 Pewter Indirect Water Heater 633-500-001
2.0 / 5

Poor quality and hidden maintenance costs (About the Weil-McLain 633500001)

Review by on Wednesday, August 20, 2014

The key here is the "sacrificial" magnesium anode. Why was it added to the latest generation of Weil-Mclain Indirect fired water heaters? I suspect it was added because their earlier tanks were probably rotting out all over the place. So I view this as a stop gap measure instead of increasing the quality of their tanks.

Be prepared to drain down your tank at least every six months to inspect the anode for decay. They do not provide a picture of a decayed anode in their manual so you will just have to guess as to how much magnesium is left. This can be confusing because the bar that holds the anode may appear to be remaining magnesium. The manual does state that the anode be inspected by a "Qualified Service Technician", so maybe the technician knows how to gauge how much magnesium is left. If that's the case be prepared to pay a technician to do it annually, or every six months depending on your water chemistry. Also be prepared to pay to have your water tested so you know if you should have it inspected every six months or every year.

Also be weary of problematic thermostats. Three (3) failures in six months. A defect they said, yet they just kept failing. Very disconcerting when your burner short cycles for hours on end due to intermittent cycling from the t-stat.

Instead of dealing with the above issues research the HTP Superstor anode, no additional costs. Highly recommended by most heating contractors.

2.7 / 5

what will the future bring (About the Weil-McLain 633500001)

Review by on Thursday, August 7, 2014

I don't know much about furnaces and hot water heaters. I'm concerned about the Weil McLain equipment now in my basement.
I had my 50 year old furnace replaced about 8 years ago. it included a gold series gas fired furnace and indirect water heater. The first water heater started leaking about 2 years ago and was replaced with an Aqua Plus.
The thermostat just went on the water heater and cost me almost $300 to get replaced. The 'new' Weil McLain equipment is costing me more than my old furnace.
I am concerned about what future repairs are coming my way. Why can't you buy equipment that lasts?

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