Oil-Fired
| D |
| C |
Outlet | Inlet |
| D | Auxiliary |
| C | Outlet |
Outlet | Inlet | T&P |
Auxiliary |
| Relief |
| Valve | |
Outlet: |
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32EC/BCS, |
| B |
71EC, |
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51EC/BCS |
| Aquastat |
T&P |
| Connection |
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C
Outlet 
High Limit
T&P
Relief
Valve
B
Aquastat
Connection
Relief |
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Valve |
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Aquastat |
| Return: |
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Connection | B | A | |
| 120E, | ||
A | 190E, |
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71E | 241E, |
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| 361E |
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50ES |
| Drain |
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Drain |
| Valve/ |
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Valve/ |
| Return |
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Return: |
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71E |
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Drain |
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Inlet/
Return
Drain
Valve
A
Valve/ | E | |
Return: | ||
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32E, |
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50ES, 51E | E | |
71E | 72E, 73E, 120E, | |
| 190E, 241E, 361E |
E
541E
Model | Storage | Rated Input | Recovery | Max. Temp | Inlet | Outlet | Return |
| Dimensions |
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| @ ∆ 90°F | Setting | Pipe | Pipe | Pipe |
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| BTH/HR | GPH | A | B | C | D | E | Standard | ASME | ||||||
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71E | 68 | 173,000 | 1.25 | 177 | 160** | 1” | 1 1/2”* | 1 1/2” | 66” | 26” | 6” | 13 1/2” | 22” | 438 | N/A |
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72E | 67 | 199,000 | 1.50 | 212 | 160** | 1” | 1 1/2”* | 1 1/2” | 58” | 28” | 8” | 16” | N/A | 503 | N/A |
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73E | 67 | 242,000 | 1.75 | 258 | 180 | 1” | 1 1/2”* | 1 1/2” | 58” | 28” | 8” | 16” | N/A | 503 | N/A |
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120E | 113 | 155,000 | 1.10 | 163 | 180 | 1” | 2”* | 2” | 67” | 31 1/2” | 6” | 19” | 22” | 709 | N/A |
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190E | 113 | 190,000 | 1.35 | 199 | 180 | 1” | 2”* | 2” | 67” | 31 1/2” | 6” | 19” | 22” | 709 | N/A |
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241E | 109 | 277,000 | 2.00 | 286 | 180 | 1” | 2”* | 2”* | 67” | 31 1/2” | 8” | 19” | 22” | 856 | 912 |
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361E | 91 | 415,000 | 3.00 | 443 | 180 | 1” | 2”* | 2”* | 67” | 31 1/2” | 9” | 23” | 26” | 1014 | 1050 |
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541E | 83 | 623000 | 4.5 | 648 | 180 | 2” | 2”* | 2”* | 66” | 34” | 10” | N/A | 30 1/2” | 1232 | 1258 |
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*Nipple not included
**Optional setting, contact factory
***Weight does not include burner and controls
T&P Valve: Factory Installed | (on selected models) |
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Drain Valve: Factory Installed Brass Valve |
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Standard Voltage (all): 120V, 60 Hz, 1P |
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Pressures (all): Working Pressure, 150 psi; Testing Pressure, 300 psi |
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ASHRAE: All Bock Products Meet or Exceed Current ASHRAE Standards. |
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Warning: Do not install on combustible flooring. Installation should be in accordance with all national and/or local codes. In the absence of local codes, refer to NFPA 31 or ANSI Z.21.10.1.
Caution: The recommended maximum hot water termperature setting for normal residential use is 120°F. Bock recommends a tempering valve or
