Astralpool HX 120 Gas Spa Heater - HX120 - aka Hurlcon - ~24kW Output
Astralpool HX 120 Gas Spa Heater - HX120 - aka Hurlcon - ~24kW Output - is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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Astralpool HX 120 Gas Spa Heater - HX120 - aka Hurlcon - ~24kW Output - is backordered and will ship as soon as it is back in stock.
AstralPool HX120 Gas Spa Heater with ~24 kW Heat Output.
Available in Natural Gas or LPG (Propane).
The AstralPool HX120 (previously the Hurlcon HX120) is Australia’s most popular replacement gas spa heater. Built for reliability and performance, it’s the trusted choice for replacing older spa heaters such as the Hurlcon HX 120 Beige, HX 150, MiniMax, MX125, MX150, HiNRG175, and Raypak Spartan 131. Proudly designed and manufactured in Australia, the HX120 has been proven for over 25 years and remains the benchmark for fast, efficient spa heating.
- Physically stocked in-store at 10 Industry Blvd, Carrum Downs, VIC.
- Enquire via the button or contact us here.
- We are an Authorised Fluidra (Astralpool / Zodiac) Dealer and Warranty Agent and offer Full Warranty protection.
-
We carry more heater spare parts than anyone!
Fast, Efficient Heating for Spas, Swimspas, and Small Pools
Gas heating remains the quickest and most dependable way to heat spas. The HX120 delivers up to 25kW of output from about 110 MJ/h gas input. It can raise 1000 L of water by 20°C in about an hour under ideal conditions — perfect for on-demand spa use.
Its copper-nickel finned-tube heat exchanger, electronic ignition, and digital touch controls provide durability and precision. The HX120 installs easily as a drop-in replacement for older Hurlcon HX/WX, Wilton or MiniMax units.
Key Features & Benefits
- Australian-made for local conditions
- Fast heat-up – ideal for spas used occasionally
- High-efficiency copper-nickel exchanger
- Digital controller with diagnostic display
- Natural Gas or LPG (Propane) compatible
- Electronic ignition – no standing pilot flame
- Compact and lightweight (~33 kg)
- Outdoor-rated; indoor conversion kits available
- Similar heating output to ~24 kW electric or ~35 kW heat pump (in cold weather)
- Designed for longevity with minimal maintenance
Typical Heating Times – Raise Water by 20 °C*
- 1000 L ≈ 65 min
- 1500 L ≈ 78 min
- 2000 L ≈ 95 min
- 2500 L ≈ 110 min
*Actual times depend on various conditions.
Technical Specifications
- Model: HX120 (Natural Gas or LPG)
- Heat Output: ~25 kW
- Gas Input: ~110 MJ/h
- Gas Use: ≈ 2–2.2 kg LPG / h | ≈ 2.6–3 m³ Nat Gas / h
- Efficiency: Up to 83 %
- Flow Rate: 150–300 L/min (bypass required above 300 L/min)
- Size: 820 mm H × 390 mm W × 515 mm D
- Weight: ~33 kg
- Gas Connection: 20 mm (½ ") BSP
Maintenance & Care
- HX heaters often last decades with proper care — many 1990s units still operate today.
- Maintain pH 7.2–7.6 and avoid low pH or high bromine/chlorine.
- Ensure good water flow and ventilation for efficiency and longevity.
Downloads & Resources
- HX Series Brochure (PDF)
- Installation & Operation Manual
- HX/WX Spare Parts List
- Optional Remote Controller
Heater & Spa Parts is Australia’s largest authorised dealer for AstralPool and Hurlcon HX series heaters. We hold real units in stock for immediate pickup and supply to qualified installers nationwide. Our team also stocks the widest range of HX and WX spare parts — heat exchangers, touchpads, controllers, and more — all genuine and compliant with Australian standards.
Search and alternate terms:
Hurlcon HX 120 Heater, Astral HX120 Spa Heater, AstralPool HX 120, HX120 Replacement Heater, Hurlcon HX150 Upgrade, Astral Spa Gas Heater, HX120 Beige Model, AstralPool Gas Heater Replacement, Hurlcon HX Series Heater Parts, Astral Pool Heater Australia.
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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