Paul Mueller Company Model D and DHS Fre-Heaters® recover up to 60 percent of the heat energy rejected from refrigeration and air-conditioning systems. The rejected heat is instead reclaimed to heat potable water for use throughout your facility, saving thousands of dollars a year in energy costs.
We have an extensive line of models that can replace any existing heat recovery unit in the field. This includes crossover models for all obsolete Therma-Stor models in the table below. Our robust stainless-steel construction means Mueller Fre-Heaters will outlast the equipment of our competitors.
| Therma-Stor Model Replacement Guide | |
| PN: | Model: |
| 4018910 | TS-II-2 |
| 4016547 | TS-III-2 |
| 4021577 | TS-II-2 HF |
| 4020166 | TS-II-1 |
| 4021540 | TS-III-1 |
| 4021956 | TS-III-1 |
| 4021992 | TS-II-1A |
| 4016850 | TS-120 |
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 available for all models in all territories.
These efficient industrial heat recovery systems save energy costs within a small footprint, making them easy to justify and 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 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 includedFinding 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.
Paul Mueller Company Headquarters
Missouri, USA
The Americas:
+1-417-575-9000
Europe, Africa, Middle East:
+31 (0)88-6830000
Asia Pacific:
+31 (0)88-6830000
At Paul Mueller Company we are united by a belief that the only quality that matters is quality that works for life. With every piece of processing equipment we build, our goal is to have lasting impact. From solar milk coolers in rural Africa, to lifesaving medical technology we are making an impact across the globe.
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