Hurlcon / Astralpool Viron & eVo Gas Pool & Spa Heater Spare Parts
Hurlcon / Astralpool Viron & eVo Gas Pool & Spa Heater Spare Parts is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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Hurlcon / Astralpool Viron and Viron eVo Gas Pool & Spa Heater Spare Parts - 2002 Onwards. Note some parts have changed, and may not be compatible. When ordering, we may contact you to confirm which series heater you have.
Fast Shipping or Pick-Up.
Please note that Astral Pool's (Hurlcon) diagrams are not ideal, and even contain errors. If you need help on parts, please contact us. Photos with Model No and Date of Manufacture are best. 
1. Viron top cover w/ visor 78615
2. Fan - RG130 - Viron 250 78131
Fan - RG 140 - Viron 350 / 450 78132
6. Gasket - Viron Evo Fan Plate
7. Insulation Top Fan Plate 78824
16. Gasket - Flue pipe seal 78130
22. Hi Limit 175C Flue 78162
23. Viron top cover w/ visor 78615
30. Header / Water Manifolds eVo Since 2013 / Prior to 2013
31. Pilot Mounting Plate 73917
33. Gasket - Fan Plate Base 15125013
42. Burner Pressing 78162 pre-2012 / Since 2013 - Now Ceramic Mesh
43. Fibre gasket 78141
44. Brass gas union 3/4" M x 3/4" F (pilot) 78813
45. Viron Pilot Ignition Pack - R310 78199 (DSI - Direct Spark Ignition)
Viron Pilot Ignition Pack 78138 (Pilot)
Viron eVo HSI Ignition Pack (Hot Surface Ignition)
47. Ignitor Gasket Outer 78161 (red silicone type or white fibre type)
48. Ignitor Gasket Inner 78143 (white glass fibre type)
49. Premix Ignitor w/ Sightglass 78134 / 78183 Ignitor w/o Sightglass
53. Float Switch 78140
Not Shown in Diagrams: Click Link for More Info
- Viron eVo Side-to-Top HSI Conversion - HSI Viron heaters with Side-ignition should be converted to Top-Ignition
- HSI Hot Surface Ignitor - SiniTride in current Virons
- Main PCB / Thermostat
- Pressure Switch / Sensor
- Brass Temperature Sensor Well
- Temperature Sensor - Pink or Black lead
- Inlet High Limit Switch - F2 Error
- Outlet High Limit Switch - F2 Error
- High Limit Brass Plug - commonly corrodes w/ F2 Error
- Barrel Union Fittings Set w/ Seals
- Ignitor Lead 78148 Long / Ignitor Lead Short 78348 eVo
- Complete Heat Exchanger
- Heat Exchanger Tube Seal Kit (Red) / Bottom Exchanger Tube Seal Kit (Blue)
- Ignition Sensor Lead - White wire
- Insulation Kit comes with front & rear insulation & box
- Fan Plate kit w/ pilot hood non-eVo <-- pilot hood commonly burns out. Recommend replacing on well-used heaters
-
Indoor Flue Conversion Kit
- eVo Flue Adapter
All other parts may be available. Contact us for more info.
Order Complete new Astralpool Viron eVo 250 350 & 450.
Please don't order diagram, as they are not for sale.
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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