
Model D
Deionized (DI) Water Heater
1-119 Gallon Capacity, Up to 58 KW Single or Three Phase Voltages
The Hubbell D model deionized water heater is specifically designed for systems requiring large draws of hot DI water with a fixed period of time between cycles. The KW rating is sized to recover enough capacity during the idle period so that the tank will be fully hot when the next draw down begins. The longer the period of time between usages, the lower the KW input required to heat the water.
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Industrial Grade Construction
- High grade construction materials provide maximum longevity
- Packaged with all electrical operating controls for trouble-free installation and operation
- Designed to operate in even the most demanding applications
Corrosion Resistant
- All Type 316L stainless steel construction resists corrosion
- Heating elements are all 316L SS to ensure long operating life
Proven Design
- Storage capacity lowers peak power demand and reduces operating costs
- Many units can be easily upgraded to handle future expansion
- Full range of sizes available to meet your exact heating needs
Model D Water Heater Specifications
1 Gallon Unit: 1/4" Male NPT
3-40 KW: 3/4" Female NPT
45-58 KW: 1 1/2" Male NPT
Surface Type: 110-170°F
Immersion Type: 100-195°F
Electronic Type: 32-194°F
Surface Type: 190°F (Fixed)
Immersion Type: 100-240°F
Electronic Type: 210°F (Fixed)
Tank: 3 Years
Electrical: 1 Year
Standard Equipment
- All Type 316L Stainless Steel construction
- 316L Stainless Steel immersion electric heating elements, passivated and electropolished
- Digital display temperature controller
- Safety Hi-Temperature cut out with manual reset
- Heavy gauge protective jacket
- Heavy duty 2" thick energy efficient insulation
- ASME rated combination temperature and pressure bronze body safety relief valve set at 150 psi, 210°F
- Low water cut off 316SS float type
(available on 6-120 gallon models)
Outline Dimensions
Model D Dimensional Data
Base Model Number | Storage Capacity (Gallons) | KW Range Available | Dimensions (Inches) | Weight (lbs) | |||
---|---|---|---|---|---|---|---|
Overall Diameter | Overall Height | Floor to Inlet "A" | Floor to T&P "B" | ||||
D1 | 1 | 1 | 9 | 9 | bottom | 6 | 15 |
HD6-3* | 6 | 1.5 - 18 | 13 | 19 3/4 | 9 5/8 | 15.5 | 95 |
HD6-6* | 6 | 24 - 58.5 | 18 | 18 | 8 1/8 | 14 | 110 |
HD16* | 16 | 6 - 88 | 31 | 23 1/2 | bottom | 19.5 | 160 |
D30 | 30 | 1.5 - 58.5 | 20 | 41.5 | 5 | 34 | 210 |
D40 | 40 | 20 | 58.75 | 5 | 51 | 225 | |
D50 | 50 | 24 | 44 | 6 | 39 | 325 | |
D65 | 65 | 24 | 52 | 6 | 43 | 350 | |
D80 | 80 | 24 | 61 | 6 | 52 | 450 | |
D100 | 100 | 28 | 53 | 7 | 43 | 500 | |
D120 | 119 | 28 | 66.5 | 7 | 57 | 575 |
*For 6 or 16 gallon capacities, please refer to the HD Model
Model D Sizing Information

GPM Heating Capacity with Amperage Chart
KW Rating | Recovery Rate in GPM at °F Temperature Rise | Amp Draw By Voltage & Phase | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
208V | 240V | 480V | |||||||||
40° | 60° | 80° | 100° | 120° | 140° | 1Φ | 3Φ | 1Φ | 3Φ | 3Φ | |
6 | 1.0 | 0.7 | 0.5 | 0.4 | 0.3 | 0.2 | 29 | 17 | 25 | 15 | 7 |
8 | 1.4 | 0.9 | 0.7 | 0.6 | 0.5 | 0.4 | 38 | 22 | 33 | 19 | 10 |
10 | 1.7 | 1.1 | 0.8 | 0.7 | 0.6 | 0.5 | 48 | 28 | 42 | 24 | 12 |
12 | 2.0 | 1.4 | 1.0 | 0.8 | 0.7 | 0.6 | 58 | 33 | 50 | 29 | 15 |
15 | 2.6 | 1.7 | 1.3 | 1.0 | 0.8 | 0.7 | 72 | 42 | 62 | 36 | 18 |
20 | 3.4 | 2.3 | 1.7 | 1.4 | 1.1 | 1.0 | 96 | 56 | 83 | 48 | 24 |
24 | 4.1 | 2.7 | 2.0 | 1.6 | 1.4 | 1.2 | 115 | 66 | 100 | 58 | 29 |
30 | 5.1 | 3.4 | 2.6 | 2.1 | 1.7 | 1.5 | 144 | 83 | 125 | 72 | 36 |
35 | 6.0 | 4.0 | 3.0 | 2.4 | 2.0 | 1.7 | 169 | 97 | 146 | 84 | 42 |
40 | 6.8 | 4.5 | 3.4 | 2.7 | 2.3 | 2.0 | 192 | 111 | 167 | 96 | 48 |
45 | 7.7 | 5.1 | 3.8 | 3.1 | 2.6 | 2.2 | 216 | 125 | 188 | 108 | 54 |
54 | 9.2 | 6.1 | 4.6 | 3.7 | 3.1 | 2.6 | 259 | 150 | 226 | 130 | 65 |
58 | 9.9 | 6.6 | 4.9 | 4.0 | 3.3 | 2.8 | 279 | 162 | 243 | 139 | 70 |
Optional Equipment
- 316 Stainless Steel Temperature and Pressure relief valve
- 1 1/2" threaded inlet/outlet connections
- Flanged inlet/outlet connections (sanitary or ANSI Class 150)
- Immersion safety hi-limit (100-240°F)
- 304 Stainless Steel protective outer jacket
- Fused low voltage control transformer (120 V)
- Power circuit fusing
- Passivated/Electropolished pressure vessel
- NEMA 4 construction for wash down areas
- ASME code stamped pressure vessel
Alternative DI/RO Water Heater Designs
- For DI/RO water heaters greater than 119 gallons storage, please see Hubbell Model SH.
- For instantaneous DI/RO water heater typically greater than 60 KW, please see Hubbell Model CR.
- For semi-instantaneous point-of-use DI/RO water heaters, please see Hubbell Model HD.
Please note: optional equipment may impact overall dimensions and weight. Please request submittal drawing from factory.
Model Number Designation D
Model:
D
Storage Capacity:
1 thru 119 Gallons

Upper KW Rating:
Typically 0
Lower KW Rating:
1 thru 58
Vessel Type:
SS = Type 316L
Stainless Steel
Voltage/Phase/Hz:
A = 120-1-60
RS = 208-1-60
R = 208-3-60
S = 240-1-60
T = 240-3-60
W = 277-1-60
T3 = 380-3-50/60
T7 = 415-3-50/60
T5 = 440-3-60
T4 = 480-3-60
T6 = 600-3-60
Example:
D120-0-40SST4
A model D with 119 gallon capacity and a 40 KW heating element. Tank is stainless steel and operates at 480V, 3 phase, 60 Hz power.
Downloads
Technical Documents
- Model D Brochure PDF (2.1 MB)
- Model D Written Spec PDF (1.1 MB)
- Model D Written Spec DOC (27.5 KB)
- Model D O&M Manual PDF (1.1 MB)
- Hubbell Bulletin - RO/DI Water PDF (156 KB)
- Stainless Steel Temperature & Pressure Relief Valve Bulletin PDF (7.4 MB)
- White Paper - Which RO/DI Water Heater Is Right For Your Application? PDF (223 KB)
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