Model D Fre-Heater® Heat Recovery System

Paul Mueller Company Model D Fre-Heaters® recover up to 60 percent of wasted energy normally discarded from refrigeration and air-conditioning systems. Channel recovered energy into single or multiple Fre-Heater units to produce more than enough hot water to satisfy your needs.

Thoroughly tested and listed by CSA US and Canada, our Fre-Heaters meet all codes required for double-wall heat exchanger construction. Canadian Registration Numbers (CRNs) are also available.

Often used in grocery stores, supermarkets, and convenience stores, Fre-Heaters are de-superheaters that remove most or all of the sensible heat from the compressor's hot discharged gas and use the existing condenser to remove the remaining heat and condense the refrigerant.

With our dual jacket, there are no concerns about refrigerant leakage and our industrial-grade, fully-insulated, glass-lined storage tank assures potable water and minimal heat loss.

These efficient industrial heat recovery systems save energy costs within a small footprint, making them easy to incorporate into your current operation. Consult a Refrigeration Products expert to help you determine the correct model and unit size for your unique heat recovery application. Model D Fre-Heaters are available in 50-, 80-, and 119-gallon capacities. 

Features

  • Stainless steel outer jacket. Rust resistant exterior requires no maintenance.
  • Mueller Temp-Plate heat transfer surface cools the superheated refrigerant from the condensing units and harvests the system’s wasted heat energy.
  • Industrial-grade, fully insulated, glass-lined storage tank assures minimal heat loss and long-term reliability.
  • Factory-installed anode(s) provides superior galvanic corrosion protection for the water storage tank. Model D-120 has two anodes, and Models D-50 and D-80 each have one anode.
  • Complies with CSA regulations for the United States and Canada, with Canadian Registration Numbers available.

  • Temperature of hot water depends on size of condensing units and cooling time.  
  • Channels recovered energy into single or multiple Fre-Heater units.
  • Designed for 150 psi maximum water working pressure and 426 psi maximum refrigerant  working pressure.
  • Available in 50-, 80-, and 119-gallon capacities.
  • A Model DE Fre-Heater offers all of the features of standard Model D Fre-Heaters with the addition of a 4,500 -watt, 240-volt electric element. Available in 80- and 119-gallon sizes. 
  • Five-year limited warranty protects your purchase.

Specifications and Sizing

Model No. Part No. Water Connection (in) No. of Refrig. Circuits Refrig. Connection Size (in) Per Circuit Refrig. Application Capacity* Height (in) Diameter (in) Approx. Shipping Weight (lb)
D-50 8828038 .75 FPT 1 5/8 ODM .5 to 4 ton 54 21.75 225 
D2-50 8828037 .75 FPT 2 5/8 ODM .5 to 4 ton  54 21.75  225 
D-80 8828036 .75 FPT 2 ¾ ODM 1 to 5 ton  59 25.25  320 
D-120 8828032 1.5 FPT 2 ¾ ODM 1 to 7.5 ton 62 29.5  475 
D2-120 8828030 1.5 FPT 2 1 1/8 ODM 3 to15 ton  62 29.5  475 
D2-120A** 8828031 1.5 FPT 2 1 1/8 ODM  3 to 15 ton  62 29.5 475
DH-120 8828029 1.5 FPT 2 1 5/8 ODM 7 to 35 ton  62 29.5  475 
DE-120 8828034 1.5 FPT 2 1 1/8 ODM 3 to 15 ton  62 29.5  475
DHS-120 8825141 1.25 FPT 1 1 5/8 ODM 14 to 70 ton 62 29.5 440
DHSE-120A4 8825142 1.25 FPT 1 1 5/8 ODM 14 to 70 ton 62 29.5 440
DHSE-120A6 8825213 1.25 FPT 1 1 5/8 ODM 14 to 70 ton 62 29.5 440
DHSE-120B6 8825214 1.25 FPT 1 1 5/8 ODM 14 to 70 ton 62 29.5 440
DA-120*** 8828033 1.5 FPT 2 1 MPT 5 to 25 ton 62 29.5 475

*Refrigeration tonnage capacities are 30°F evaporator ton loads, not total heat of rejection tons. Pressure drop through a Fre-Heater refrigeration circuit will be approximately 15 psi at the maximum tonnage application. Pressure drop at the mid-range of tonnage application will be approximately 5 to 7 psi. The best overall refrigeration/heat recovery system efficiency is usually obtained at or below the mid-range tonnage application.

**Aquastat included
***Ammonia only

Financing

Finding the right equipment that fits within your budget can be daunting. At Paul Mueller Company, we understand your needs. That’s why we offer Leasing options that give you more flexibility.


Tell us more about your needs.