Astralpool Viron, ICI, HiNRG HSI Hot Surface Igniter - Sinitride
Astralpool Viron, ICI, HiNRG HSI Hot Surface Igniter - Sinitride is backordered and will ship as soon as it is back in stock.
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Astralpool Viron, ICI, HiNRG HSI Hot Surface Igniter - Sinitride is backordered and will ship as soon as it is back in stock.
Hot Surface Igniter / Ignitor used in Astralpool Viron eVo 250, 350, 450 all HiNRG 175, 250, 400 ICI 200, ICI 400 gas pool & spa heaters. Sinitride (Silicon Nitride) Material with Ceramic.
AstralPool Part No: 726067.
Fast Shipping or Pick-Up
Fits the following heaters:
Astral Pool: HiNRG 175, HiNRG, 250, HiNRG 400, Viron eVo 250, Viron eVo 350, Viron eVo 350, Viron eVo 450, ICI 200, ICI 400 (and B & C series).
Dimensions: "Hot" SiNi part: 72mm long by 16mm. Overall Length: 115mm
Important Information:
As with all gas appliance parts, hot surface igniters should be diagnosed, installed, and tested by a suitably qualified and experienced licensed gas technician. An igniter failure is often a symptom of another issue within the heater, not necessarily a fault with the igniter itself.
Before fitting a replacement igniter, we strongly recommend inspecting the inside of the heater, ideally with a borescope, to confirm the burner, combustion chamber, heat exchanger area, and igniter mounting area are in good condition.
Burnt wiring, melted insulation, heat damage around the igniter, or discoloured terminals usually indicate excessive external heat or a heater fault. This may be caused by flame rollout, incorrect gas pressure, poor combustion, blocked burners, incorrect installation, or repeated ignition attempts.
If the underlying cause is not corrected, a replacement igniter may fail again quickly. Heat-damaged wiring or burnt connectors are not normally considered a manufacturing fault with the igniter itself.
Other Numbers Possibly Associated: 6085114, 21C01501001, 9343609046491, 9343609059231, 726067, SP726067, SKHSI
Does not suit INSNRG Heaters!
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 | ~60.2–60.8 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) |
|---|---|---|
| 1/2" | 15 mm | ~21.2–21.5 mm |
| 3/4" | 20 mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 32 mm | ~42.1–42.4 mm | |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 65 mm | ~75.2–75.5 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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