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Features
- Stainless Steel Construction
- With the tank and coils made from stainless steel materials, the Heat-flo Indirect Water Heater provides outstanding heat transfer. Stainless steel also provides a longer life to the tank and coils.
- Coil Design
- The Heat-flo Indirect Water Heaters features large coils with a smooth-wall design. With no finned tubing, the coils won't collect lime and sediment.
- Simple Installation
- All connections are on the top of the Heat-flo Indirect Water Heater, making for a simple and easy installation.
- Well Insulated
- With over 2" of insulation, the Heat-flo Indirect Water Heater provides less that 1° of heat loss. The thermoplastic jacket does not corrode and resists denting.
Made from high quality stainless steel materials and a smooth-wall coils, the Heat-flo Indirect Water Heater provides excellent heat transfer as well as a longer tank life. With abundant hot water and low operating costs, the Heat-flo Indirect water heater is an efficient choice for your hot water needs.
Specifications
HF-40

General Information
Type
Indirect Water Heater
Product Line
Heat-flo
Medium
Medium
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
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
Tank
Coils Quantity
1
Connection Type
NPT
Performance
First Hour Delivery
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.
254 Gallons
Continuous Recovery Rate
218 Gallons
Dimensions
Storage Volume
40 Gallons
Cold Water Inlet
3/4 Inch
Hot Water Outlet
3/4 Inch
Supply Connection
1 Inch
Return Connection
1 Inch
Product Height
44 Inches
Product Width
23 1/2 Inches
Shipping Weight
100 Pounds
Warranty Information
Vessel Warranty
1 Year
Reviews
(1)
WSD HF-40 Reviews & Ratings

Good Replacement For My Previous HF-40
By William T
Londonderry, New Hampshire
Purchased 08/10/2020 |
Review Posted 09/01/2020
I had a HeatFlow HF-40 before. The unit works as expected. When I had my first unit, I tried to contact the manufacturer to get a replacement thermostat, but they "don't sell to the public" so I had to put one together myself. The first unit lasted about 12 years before I started having problems, mostly because of hard well water. For the next 7 or so I kept it working but it finally rusted away. The new one seems to be working well.
William T Recommends This
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Rating Breakdown
3/5
3/5
3/5
3/5
Pros:
Quiet
Cons:
Durability
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Heat-flo - 40 Gallon - Indirect Water Heater




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