NLS - Zodiac ZS500 Heat Pump - 15kW & 20kW
NLS - Zodiac ZS500 Heat Pump - 15kW & 20kW - is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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No Longer Sold - The Zodiac ZS500 sets a new benchmark for pool heat pumps. By utilising inverter technology combined with a vertical fan unit, this heat pump provides you with the ultimate performance while also maintaining premium energy efficiency. It operates almost silently and can fit just about anywhere in or around your pool area – great for conserving outdoor space.
These come in two sizes: 15kW & 20kW
- Price cannot be shown as per Astralpool Authorised Dealer Agreement.
- Anyone advertising a price online is not an Authorised Dealer and this can affect warranties.
- Kept Physically in Stock at 10 Industry Blvd, Carrum Downs, Vic
Three heating modes
- ECO mode allows the ZS500 to operate at as little as 50% power to reduce costs.
- Smart mode operates between 50% and 100% power capacity.
- Boost mode allows you to run your ZS500 at 100% power, ideal for heating your pool quickly.
Vertical fan unit for discreet installation
Unlike conventional heat pumps that require a 5-metre radius of clear space to install, the ZS500 has a vertical fan system, allowing it to be concealed behind a wall or trees without compromising its performance.
User-friendly controls interface
The user-friendly and simple design of the ZS500’s controls interface allows you to set your desired water temperature and select your heating mode in a single step.
| Model No. | MD5 (15kw) | MD8 (20kw) |
|---|---|---|
| Pool Coverage | ||
| Recommended Pool Volume | 80,000L | 110,000L |
| Maximum Operating Power | 13.9A | 22A |
| Nominal Operating Power | 10A | 15A |
| Electric Power Supply | 230V / 1 / 50Hz | 230V / 1 / 50Hz |
| Hydraulic Connection | PVC ∅40 or 50 1/2 unions to glue | PVC ∅40 or 50 1/2 unions to glue |
| Average Water Flow | 5000L/h | 6000L/h |
| Equipment | ||
| COP (Coefficient of Performance) (at Air=28°C) | 5.4 | 6 |
| Consumed Power (at Air=28°C) | 1.6kW | 2.6kW |
| Operating Power Minimum (at Air=28°C) | 7.8kW | 10.5kW |
| Operating Power Medium (at Air=28°C) | 11.4kW | 15.6kW |
| Operating Power Maximum (at Air=28°C) | 11.6kW | 20kW |
| Power Cable Size | 3 × 2.5 (For a maximum length of 20m) | 3 × 6 (For a maximum length of 20m) |
| Acoustic Pressure at 10m | 38/34/29 (dB(A)) | 39/36/25 (dB(A)) |
Recommended Retail Prices:
Zodiac ZS500 MD5: $10,175.89
Zodiac ZS500 MD8: $12,395.14
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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