Astralpool Hurlcon Gas Heater Temperature Sensor - Thermistor
Astralpool Hurlcon Gas Heater Temperature Sensor - Thermistor is backordered and will ship as soon as it is back in stock.
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Genuine Astral Hurlcon Temperature Sensor (thermistor) Lead. Suits all Hurlcon and Astralpool heaters with Digital Thermostat since 2001. Replaces all older Black, Red, and Yellow wired temperature sensors.
May resolve F0 error or false temperature readings. Part 70276. Often temp sensors fail when water has leaked into the brass well.
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This Temp Sensor Fits the Following Heaters (post 2001):
- Hurlcon Astral HX Series:
- HX 70, HX 120, HX 150
- Hurlcon Astral MX Gas Heaters:
- MX 125, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, MX 500
- Hurlcon Astral JX Wall-Mount Gas Heaters:
- JX 130, JX 160
- Hurlcon Astral WX Wilton Gas Heaters:
- WX 70, WX75, WX 120
- Hurlcon Astral Viron & Viron eVo:
- Viron 250, Viron 350, Viron 450, Viron 450 <--also used as heat exchanger temp sensor
- Hurlcon Astral HiNRG:
- HiNRG 175, HiNRG 250, HiNRG 400
- Astralpool ICI:
- ICI 200, ICI 400,
- Jacuzzi:
- J-HN250C & J-HN400C
- Hurlcon Boilers:
- HB 200, HB 250, HB 300, HB 400, HB 500
Notes & More Information:
- Often temp sensors fail when water has leaked into the brass well.
- Often solves the F0 (FO) error found on Hurlcon & Astral pool heaters.
- These newer sensors are slightly larger than older sensors and may require a new brass well.
- Also replaces the Heat Exchanger (H/X) temperature sensor in Viron heaters.
- Also called Temp Sensor, Temperature Sensor, or Thermistor - Part: 70276
- Brass well Listed Here.
- Seal & Bypass Kits are Listed Here
- Complete HX, JX, MX, Viron, HiNRG Service Kits are Listed Here
hurlcon temp sensor, astral temp sensor, astral pool temp sensor, hx temp sensor, temp sensor
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:
| Imperial Name | Metric Name | Pipe Diameter (OD) |
|---|---|---|
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.5 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly what their name suggests.
Understanding Plumbing Sizes & Nominal Measurements
Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems so that pipes and fittings remain compatible.
Why pipe sizes don’t match the measurements
The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate. Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.
How to Measure Pipe Correctly
-
Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
- Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
- The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).
PVC Pressure Pipe AS/NZ 1477 Dimensions1:
Common nominal sizes with typical outside diameters and indicative inside diameters by class.
| Imperial Name | Metric Name | Outside Diameter (OD) | Class 9 IDº | Class 12 IDº | Class 18 IDº |
|---|---|---|---|---|---|
| 1/2" | 15 mm | ~21.2–21.5 mm | 18.3 mm | 17.8 mm | |
| 3/4" | 20 mm | ~26.6–26.9 mm | 23.7 mm | 22.4 mm | |
| 1" | 25 mm | ~33.4–33.7 mm | 30.5 mm | 29.8 mm | 28.1 mm |
| 32 mm | ~42.1–42.4 mm | 38.5 mm | 37.5 mm | 35.4 mm | |
| 1.5" | 40 mm | ~48.1–48.4 mm | 45.2 mm | 44.1 mm | 42.8 mm |
| 2" | 50 mm | ~60.2–60.5 mm | 55.2 mm | 53.7 mm | 50.5 mm |
| 65 mm | ~75.2–75.5 mm | 68.9 mm | 67.0 mm | 63.2 mm | |
| 2.5" | ~73 mm |
- º Internal diameters vary slightly by manufacturer and class.
- 1 Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.
Hose & Tube Dimensions
Common flexible hose sizes used in pool/spa systems (approximate IDs).
| Imperial Name | Metric Name | Inside Diameter (ID) |
|---|---|---|
| 3/8" | 9–10 mm | ~9 mm |
| 3/4" | 19 mm | ~19 mm |
BSP – British Standard Pipe Thread Sizes
BSP thread names are also nominal. The thread OD will not equal the nominal name.
| BSP Thread Size Naming | Outside Diameter (mm / inch) | TPI |
|---|---|---|
| 1/16" BSP | 7.7 mm / 0.304" | 28 |
| 1/8" BSP | 9.7 mm / 0.383" | 28 |
| 1/4" BSP | 13.16 mm / 0.518" | 19 |
| 3/8" BSP | 16.66 mm / 0.656" | 19 |
| 1/2" BSP / 15 mm | 20.99 mm / 0.825" | 14 |
| 5/8" BSP | 22.99 mm / 0.902" | 14 |
| 3/4" BSP / 20 mm | 26.44 mm / 1.041" | 14 |
| 7/8" BSP | 30.20 mm / 1.189" | 14 |
| 1" BSP / 25 mm | 33.25 mm / 1.309" | 11 |
| 1-1/4" BSP | 41.91 mm / 1.650" | 11 |
| 1-1/2" BSP / 40 mm | 47.80 mm / 1.882" | 11 |
| 2" BSP / 50 mm | 59.61 mm / 2.347" | 11 |
| 2-1/4" BSP | 65.71 mm / 2.587" | 11 |
| 2-1/2" BSP | 75.18 mm / 2.960" | 11 |
| 3" BSP | 87.88 mm / 3.460" | 11 |
| 4" BSP | 113.03 mm / 4.450" | 11 |
| 5" BSP | 138.43 mm / 5.450" | 11 |
| 6" BSP | 163.83 mm / 6.450" | 11 |
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