Amtrol HM-41ZDW
Amtrol HM-41ZDW
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Amtrol HydroMax - 41 Gallon - Indirect-Fired Water Heater - HDPE - Black



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Amtrol HydroMax - 41 Gallon - Indirect-Fired Water Heater - HDPE - Black
Amtrol HydroMax - 41 Gallon - Indirect-Fired Water Heater - HDPE - Black
Model: HM-41ZDW
Product Q&A
How-To Articles


    For almost 70 years Amtrol has continued to roll out top of the line HVAC technology. The HM indirect-fired water heater is the perfect example of the innovation they continue to provide. With advanced control technology paired with undeniable reliability, HM's modern design is unique as well as efficient. By using your home's boiler energy, HM reduces fuel cost while maximizing hot water output. There is no flame, flue, or fuel lines giving you the freedom to install almost anywhere, and a triple shelled tank ensures strength and longevity. A Hi-Delta heat exchanger provides performance from optimal coil spacing, and is removable for easy cleaning and service. Equipped with a relief valve, blowdown tube, heat trap, and Turbulator Dip Tube to reduce sediment build-up, there is no doubt that the HM is "Efficiency at its Best". This water heater is equipped with a double walled coil for regional code compliance.

    Product Features

    Bimodal HDPE Poly Bottle
    A high density polyethylene (HDPE) bottle is corrosion-proof and provides fresh, clean water, while resisting chlorides, scale, or aggressive water.

    Unique Molded Insulation
    The HM has reaction injection molded (RIM) insulation which enhances efficiency by eliminating gaps that lead to heat loss.

    Deep Drawn Steel Construction
    Deep drawn steel has twice the strength of regularly used steel construction while a Tuf-Kote HG finish repels harsh or damp environments.

    Bottom Mounted Drain Valve
    A pre-installed bottom mounted drain valve completely empties the tank while a sediment trap captures and flushes debris that would otherwise be left in the tank.

    Hi-Delta Heat Exchanger
    Both energy efficient and scale resistant, the Hi Delta heat exchanger is designed with optimal coil spacing for performance, and is removable for easy cleaning.

California residents see
Warning: This product can expose you to chemicals including Lead which is known to the State of California to cause Developmental Harm.
For more information go to:


specs product image PID-23080
Product Category
Water Heater - Indirect-Fired
General Information
Indirect Water Heater
Product Line
Product Category
Water Heater - Indirect-Fired
Medium Learn More
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.
Hot Water
Fuel Type Learn More
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Indirect Fired
Storage Type
Control Type
Connection Type
41 Gallons
First Hour Delivery Learn More
First Hour Delivery
Sometimes called First Hour Rating, this is the number of gallons of hot water the heater can supply per hour when starting with a fully heated tank. The recovery of the water heater depends on your boiler's BTU and boiler output temperature.
224 Gallons
Continuous Recovery Rate
242 Gallons
Connection Size
3/4 Inch
Product Diameter
22 Inches
Product Height
55 Inches
Product Weight
124 Pounds
Shipping Height
51 Inches
Shipping Width
22 Inches
Shipping Length
22 Inches
Shipping Weight
124 Pounds
Country of Origin
United States
Warranty Information
Warranty Learn More
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
7 Years


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Product Q&A

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Product Questions Answered by Ken, the eComfort Product Expert
Please explain "indirect fired." Does it need to be connected to a existing boiler?
from District of Columbia 
September 13, 2015

How-To Articles

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Signs You Need a New Water Heater
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An Intro to Indirect Water Heaters
An Intro to Indirect Water Heaters
If you heat your home with a boiler, you have the opportunity to get the most e...
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eComfort How-To Library
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Amtrol HydroMax - 41 Gallon - Indirect-Fired Water Heater - HDPE - Black
Amtrol HM-41ZDW
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