Thermal Regulator Kit For ASME Heaters Manufactured prior to 10/2012 (Old Header Design)
Kit Includes: Spring Clip, & Install Tools (ASME)
California Residents WARNING: Cancer and Reproductive Harm
Exploded parts diagram: This part is shown on the Pentair MasterTemp Gas Heater Water System exploded parts diagram.
🔧 Pentair MasterTemp Gas Heater Water System – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| – | _U11-197P |
| – | 46-102-1000 |
| – | 46-102-1002 |
| – | Heat Exchanger Kit, Pentair MasterTemp HD 250 ASME |
| – | 46-102-1005 |
| – | 46-102-1020 |
| – | 46-102-1025 |
| – | 46-102-1030 |
| – | 46-102-1035 |
| – | 46-102-1040 |
| – | 46-102-1045 |
| – | 46-102-1050 |
| – | 46-102-1055 |
| – | 46-102-1060 |
| – | 46-102-1100 |
| – | 46-102-1105 |
| – | 46-102-1110 |
| – | 46-102-1115 |
| – | 46-102-1120 |
| – | 46-102-1125 |
| – | 46-102-1130 |
| – | 46-102-1150 |
| – | Gas Heater, LP, Pentair MasterTemp, 250K BTU, E-Commerce |
| – | Gas Heater, NG, Pentair MasterTemp, 400 BTU, E-Commerce |
| – | Kit Thermal Regulator ◀ this part |
| – | _460923 |
| 23 | 46-110-W025K23 |
| 22 | Pressure Relief Valve, Pentair Max-E-Therm, ASME |
| 21 | Plug, Pentair MasterTemp/Max-E-Therm, 3/4" mpt, Zinc |
| 20 | Drain Plug, Pentair Sta-Rite, 1/4"mpt, with O-Ring |
| 18 | O-Ring, 1-5/8" ID, 3/16" Cross Section, Generic |
| 16 | Thermal Regulator, Pentair MasterTemp |
| 15 | Thermal Regulator Kit, Pentair MasterTemp/Max-E-Therm |
| 14 | Connecter Tube, Pentair MasterTemp/Max-E-Therm, w/O-Ring |
| 13 | O-Ring, 2" ID, 1/8" Cross Section, Generic |
| 12 | Hardware Kit, Pentair MasterTemp, 5/16-18 x 3-1/4" |
| 11 | Washer, Pentair Sta-Rite, 5/16" |
| 9 | 46-110-W025K9 |
| 8 | Manifold Bypass Valve Kit, Pentair MasterTemp/Max-E-Therm |
| 5 | O-Ring, Kit Pentair MasterTemp/Max-E-Therm, Manifold |
| 3 | 46-110-W025K3 |
| 2 | 46-110-W025K2 |
| 1 | 46-110-W025K1 |




