• Heat-Flo 316 Stainless Steel Indirect Water Heater Tank with single heat exchanger, one set of 3/4 in side ports and 3/4 in drain - 40 Gallon Low Boy - HF-40 LOW-SP

    Product ID • HEFL40LOWSPE

  • $1,579.00
  • Estimated Overland Truck Shipping Truck Shipping


The Heat-Flo stainless steel indirect water heater HF-40 LOW-SP Lowboy Tank is ideal for use with any hydronic heating system, radiant heat system or Solar Hot Water Heating system. The Heat Flo HF-40 LOW-SP comes with 2 extra Side Ports - both 3/4 Inch. You can use 1 for an additional feed and drain. The Heat Flo HF-40 LOW-SP  has a single heat exchanger made of high quality stainless steel. The high quality of the design and fabrication of these complete stainless steel heaters ensure efficient, maintenance-free operation and continuous supply of hot water. These rugged units are designed for heating large volumes of domestic or process water for residential, commercial or industrial applications. If you are looking for a lot of hot water, that is much faster and a lot cheaper, the Heat-Flo indirect water heater is the answer.

What is an indirect water heater? An indirect is a storage tank with a heating coil built inside the tank. Hot water from any hydronic heating boiler is circulated through the coil inside to heat all the water in the tank. The unit is piped like any other heating zone.

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Technical Specs

Heat-Flo 316 Stainless Steel Indirect Water Heater Tank HF-40 LOW-SP Techs and Specs

  • Capacity Gallons
  • Heat Exchangers
  • Min Boiler Water Flow Through Coil (gpm)
  • Pressure Drop Through Coil (in feet)
  • Coil Heating Surface (sq.feet)
  • Max Working Pressure (psi feet)
    150 PSI
  • Heat Exchanger Output
    123,500 Btu/Hr
  • Output First Hour (Gallons *)
  • Output Continuous (Gallons *)
  • Extra Side Ports
  • Extra Side Ports Size NPT
    3/4 Inch
  • Connection Domestic NPT
    3/4 Inch
  • Connection Boiler NPT
    1 Inch
  • Diamter Size
    28 Inch
  • Height
    36 Inches
  • Shipping Weight
    90 Pounds
  • * Based on a 200 degree boiler water supply and a 50 degree cold water input. For 180 degree F boiler water supply multiply by ratings by 0.86

Heat-Flo 316 Stainless Steel Indirect Water Heater Tank HF-40 LOW-SP Features

  • Tanks and coils are all stainless steel construction
  • Large smooth wall coils deliver full output for years. No finned tubing to collect lime and sediment
  • Includes over 2 Inches of insulation, less than 1 Degree /hr. heat loss, and a flexible thermoplastic jacket that will not dent or corrode
  • All connections are on top for a neat, clean installation
  • Brass drain and relief valves are factory installed
  • Honeywell 4006 aquastat control is standard
  • Limited lifetime warranty residential installations 5 years commercial
  • Made in the USA

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