

Model CR
Packaged Instantaneous Circulation Heater
Full KW Selection In All Voltages, Single or Three Phase
The Hubbell CR model is a highly reliable and easily maintained heater designed for continuous operation in a commercial or industrial application. Each heater is constructed to meet the specific requirements of your system and is available in a full array of operating controls, materials, and design styles. Its compact, highly efficient design takes up minimal floor space, reduces operating costs, and is factory packaged with all operating controls. Hubbell's vast experience, meticulous engineering, and advanced manufacturing processes ensure that you can rely on the CR model for your heating needs in even the most demanding and critical application. It makes sense to specify and install a Hubbell CR model for your heating requirements, as the owner will be provided with a quality product that is long lasting and trouble-free.

Heavy Duty Construction
- Constructed with high grade materials to ensure long operating life
- Turn-Key package is simple to specify and operate
- Factory wired electrical controls provide trouble-free installation and operation
Reliability
- Engineered for your specific application to ensure reliable operation
- Full selection of materials and controls to meet even the most demanding application
High Efficiency
- On demand heating eliminates costly and cumbersome storage tanks
- Instantaneous design reduces standby heat loss and lowers operating costs
CR Model Standard Equipment
Vessel Construction
- Designed and built in strict accordance with the ASME Code Section IV and stamped, certified and registered with the National Board of Boiler and Pressure Vessel Inspectors (units over 58 KW only)
- All welded Type 304 Stainless Steel pressure vessel
- Designed for 150 psi working pressure and hydrostatically tested
Electrical Operating Controls
- All electrical operating controls are factory sized, selected, wired, tested, and mounted in a NEMA 1 enclosure to ensure safe and reliable operation
- A power distribution block is supplied for single point electrical installation
- Power fuses rated at a maximum of 60 Amps protect each heating element branch circuit. Each branch circuit has a maximum rating of 48 Amps
- Heavy duty resistive load rated magnetic contactors with integrally mounted power fuse block assembly
- Heavy duty ANSI Class 150 flange type immersion heating element provides long service life
- Factory installed flow switch prevents the element from energizing in low/no flow conditions
- Fully adjustable temperature controller maintains accurate water temperature and is sized by the factory to control the appropriate number of heating element circuits
- A high quality generously sized transformer provides fused 120V to the control circuit
- A fully adjustable (100-240°F) safety hi-limit device with manual reset interrupts power to the control circuit in the event of over-temperature water
- Safety door interlock mechanism interrupts power to the control circuit upon opening the electrical control panel
General
- Heavy duty 2" thick fiberglass type blanket insulation for maximum operating efficiency and minimal standby heat loss
- Heavy gauge galvanized steel protective jacket keeps insulation in place to ensure high efficiency during operation
- Horizontal configuration supported on heavy duty integrally welded steel I beam supports for sturdy floor mounting
- Full five (5) year Non Pro-Rated vessel warranty and one (1) year electrical component warranty
- Bronze ASME rated combination temperature and pressure safety relief valve set at the vessel working pressure and 210°F
Outline Dimensions
Dimensional Data
KW | Recovery Rate in GPM At °F Temperature Rise | Approx. Dimensional Data (Inches) |
Inlet/ Outlet (Inches) |
Amperage Rating At Three Phase Power | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
10° | 20° | 40° | 60° | 80° | 100° | 120° | 140° | "A" | "B" | "C" | "D" | 208V | 240V | 380V | 415V | 480V | ||
25 | 17.0 | 8.5 | 4.3 | 2.8 | 2.1 | 1.7 | 1.4 | 1.2 | 36 | 32 | 19 | 34 | 3/4 MNPT | 70 | 60 | 38 | 35 | 30 |
45 | 30.7 | 15.4 | 7.7 | 5.1 | 3.8 | 3.0 | 2.6 | 2.2 | 48 | 32 | 19 | 40 | 3/4 MNPT | 125 | 108 | 68 | 63 | 54 |
58 | 39.6 | 19.8 | 9.9 | 6.6 | 4.9 | 3.9 | 3.3 | 2.8 | 48 | 36 | 19 | 40 | 1.5 MNPT | 161 | 140 | 89 | 82 | 71 |
72 | 49.2 | 24.6 | 12.3 | 8.2 | 6.1 | 4.9 | 4.1 | 3.5 | 54 | 40 | 24 | 44 | 1.5 MNPT | 200 | 173 | 109 | 100 | 86 |
90 | 61.5 | 30.7 | 15.4 | 10.2 | 7.7 | 6.1 | 5.1 | 4.4 | 60 | 40 | 24 | 50 | 1.5 MNPT | 250 | 217 | 137 | 126 | 109 |
120 | 82.9 | 41.0 | 20.5 | 13.7 | 10.2 | 8.2 | 6.8 | 5.9 | 60 | 48 | 24 | 50 | 2 MNPT | 334 | 290 | 184 | 169 | 146 |
150 | 102 | 51.2 | 25.6 | 17.1 | 12.8 | 10.2 | 8.5 | 7.3 | 60 | 48 | 24 | 50 | 2 MNPT | 417 | 362 | 229 | 211 | 182 |
175 | 120 | 59.7 | 30.0 | 19.9 | 14.9 | 11.9 | 10.0 | 8.5 | 60 | 48 | 24 | 50 | 2 MNPT | 487 | 422 | 267 | 246 | 213 |
200 | 136 | 68 | 34 | 22 | 17 | 13.6 | 11.9 | 10.2 | 72 | 54 | 30 | 62 | 2 MNPT | 555 | 481 | 304 | 278 | 240 |
225 | 153 | 76 | 38 | 25 | 19 | 15.3 | 13.7 | 11.7 | 72 | 54 | 30 | 62 | 3 FLG | 625 | 541 | 342 | 313 | 270 |
250 | 170 | 85 | 42 | 28 | 21 | 17.0 | 15.9 | 13.7 | 72 | 54 | 30 | 62 | 3 FLG | 694 | 602 | 380 | 348 | 301 |
300 | 205 | 102 | 51.2 | 34.1 | 25.6 | 20.4 | 17.1 | 14.6 | 72 | 66 | 36 | 62 | 4 FLG | 835 | 724 | 459 | 419 | 362 |
350 | 239 | 120 | 59.7 | 39.8 | 29.9 | 23.8 | 20.0 | 17.1 | 72 | 66 | 36 | 62 | 4 FLG | 974 | 844 | 535 | 489 | 423 |
400 | 273 | 137 | 68.3 | 45.5 | 34.1 | 27.2 | 22.7 | 19.5 | 84 | 66 | 36 | 70 | 5 FLG | 1113 | 965 | 611 | 558 | 482 |
500 | 342 | 171 | 85.3 | 56.9 | 42.7 | 34.0 | 28.4 | 24.4 | 84 | 66 | 36 | 70 | 5 FLG | 1391 | 1206 | 764 | 698 | 603 |
600 | 410 | 205 | 102 | 68.3 | 51.2 | 40.8 | 34.1 | 29.3 | 96 | 72 | 48 | 84 | 5 FLG | 1669 | 1447 | 916 | 837 | 723 |
700 | 478 | 239 | 119 | 79.6 | 59.7 | 47.6 | 39.8 | 34.1 | 96 | 72 | 48 | 84 | 6 FLG | 1947 | 1688 | 1069 | 976 | 843 |
850 | 581 | 290 | 145 | 96.7 | 72.5 | 57.8 | 48.4 | 41.4 | 108 | 72 | 54 | 96 | 6 FLG | - | - | 1296 | 1184 | 1023 |
1000 | 683 | 341 | 171 | 114 | 85.3 | 68.0 | 56.9 | 48.8 | 108 | 76 | 60 | 96 | 6 FLG | - | - | 1521 | 1389 | 1200 |
1200 | 820 | 409 | 205 | 137 | 102 | 81.6 | 68.3 | 58.5 | 108 | 76 | 60 | 96 | 6 FLG | - | - | 1825 | 1667 | 1440 |
1400 | 956 | 478 | 239 | 159 | 119 | 95.2 | 79.6 | 68.3 | 108 | 76 | 60 | 96 | 6 FLG | - | - | - | 1945 | 1681 |
1600 | 1093 | 546 | 273 | 182 | 137 | 108 | 91.0 | 78.0 | 108 | 76 | 60 | 96 | 6 FLG | - | - | - | - | 1925 |
1. Consult factory for vertical and wall mounted dimensions.
2. The KW selections above are shown for convenience. A full selection of KW ratings up to 1600 KW is available by simply entering the desired KW into the model number.
Model CR Sizing Information

Electrical

CR Model Optional Equipment
Vessel
- Alternate material construction: Stainless Steel Type 316L, 90/10 Copper-Nickel, Carbon Steel, Galvanized Steel, other
- Pressure vessel designed, constructed and stamped according to section VIII of the ASME Code
General
- Vertical configuration with heavy duty support base
- Wall hung construction for (horizontal, vertical) off the floor installation
- Stainless steel outer protective jacket
Electrical
- NEMA 4 enclosure for outdoor/wet locations
- Explosion resistant construction for hazardous locations
- Built-in circuit breaker (with or without shunt trip) or a built-in non-fused On/Off disconnect switch
- Alternate element sheath material: Incoloy, Stainless Steel, Inconel, Monel, Steel, Teflon, Titanium, other
- Integrated PLC Control Package
- Factory installed low water cut out device prevents the element from energizing if there is no water in the unit
- Specialized heating element construction including: Special watt density rating, passivation, electropolishing, baffles, or any other feature required to meet the needs of your application
- Digital display electronic temperature controller
- SCR power control package for full proportional control of the heating element
- Dial thermometer and pressure gauge
- Status indicating lamp(s)
- Audible alarm system
- RS485 communication port for remote operation of the temperature controller
Please note: optional equipment may impact overall dimensions and weight. Please request submittal drawing from factory.
Model Number Designation CR
Model:
CR
KW:
Enter desired KW
Vessel Construction:
SS = Stainless Steel
(Type 304 or 316L)
M = Galvanized Steel
CS = Copper-Silicon
CN = 90/10 Copper-Nickel
BL = Carbon Steel
Voltage/Phase/Hz:
RS = 208-1-60
R = 208-3-60
S = 240-1-60
T = 240-3-60
W = 277-1-60
T3 = 380-3-60/50
T7 = 415-3-60/50
T5 = 440-3-60
T4 = 480-3-60
T6 = 600-3-60
Example:
CR175SST4
A model CR water heater rated at 175KW with a stainless steel vessel. Electrical rating is 480 volt, three phase, 60 Hz.
Downloads

Data Sheet (CR280SST4)
PDF (2.1 MB)
Technical Documents
- Model CR Brochure PDF (1.6 MB)
- Model CR Written Spec PDF (397 KB)
- Model CR Written Spec DOC (28.0 KB)
- Model CR AIA Master Spec PDF (38 KB)
- Model CR AIA Master Spec DOCX (31.0 KB)
- Model CR O&M Manual PDF (1.3 MB)
- Hubbell Bulletin - CR Clean Steam Generator PDF (309 KB)
- Model CR ABS Approval Certificate PDF (448 KB)
- Model CR Installation Drawing PDF (81 KB)
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