Henden Essential Inverter Heat Pump 21kW
Henden Essential Inverter Heat Pump 21kW is temporarily out of stock and will ship as soon as it's available.
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Warranty Information
Warranty Information
Henden Essential Inverter Heat Pump 21kW
Henden Essential Inverter Heat Pump 21kW is temporarily out of stock and will ship as soon as it's available.
Henden Essential Inverter Heat Pump 21kW
- Shipped Australia wide from VIC, NSW, QLD and WA.
- Genuine Henden product
The Henden Essential Inverter Heat Pump 21kW is an electric swimming pool heat pump. It draws latent heat from the surrounding air and transfers it into the pool water, delivering efficient year-round heating at a fraction of the running cost of gas.
The Essential range uses DC inverter technology for energy efficiency and quiet operation, with a compact casing, touch screen controller and built-in Wi-Fi for app control of temperature and timers.
Features
- DC inverter technology
- Smart and Silence dual mode
- Built-in Wi-Fi and app compatibility
- Intuitive touch screen controller
- External 3 point quick connection for pump control, automation and RS485
- R32 refrigerant
Performance
| Heating capacity (air 26°C, water 26°C) | 20 kW |
| COP range (air 26°C) | 11.8 to 6.5 |
| Heating capacity, Smart mode (air 15°C, water 26°C) | 14 kW |
| COP range (air 15°C) | 6.5 to 4.6 |
| Cooling capacity (air 35°C, water 28°C) | 7.8 kW |
| Advised pool volume | 45 to 80 m³ |
Specifications
| Power supply | 230V / 1 Ph / 50Hz |
| Rated input power (air 15°C) | 0.75 to 3.04 kW |
| Rated input current (air 15°C) | 3.26 to 13.21 A |
| Working air temperature | 0°C to 43°C |
| Refrigerant | R32 |
| Water connection | 48.3 mm |
| Sound pressure at 1 m | 45.3 to 57.1 dB(A) |
| Sound pressure at 10 m | 25.3 to 37.1 dB(A) |
| Dimensions (L × W × H) | 962 × 349 × 754 mm |
| Net weight | 68 kg |
| Minimum clearance | 500 mm front, 300 mm sides, 300 mm back |
Warranty
Residential warranty: heat exchanger 25 years, compressor 10 years, componentry 5 years, labour 1 year.
Special order item.
SKU: 1547160
Manufacturer Documents
To the layperson, plumbing sizes and their names can be confusing due to the nominal sizes and naming conventions used.
This is not something we made up. Plumbers and manufacturers have used nominal (meaning ‘by name only’) sizing for decades.
Simply put, in plumbing, named sizes are often not the actual measurements of the pipe, fitting, or part. A PVC pipe called “50mm” or “2"” does not measure 50 mm anywhere. Instead, it follows nominal sizing, an internationally-standardised naming system.
Almost all fittings we use in the pool & spa industry use “pressure PVC” pipe & fittings. Do not confuse with “DWV” or other pipe & fittings and their names and sizes.
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) |
|---|---|---|
| 1/2" | 15mm | ~21.2–21.5 mm |
| 3/4" | 20mm | ~26.6–26.9 mm |
| 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 |
To reiterate, these are nominal sizes and are designed to fit matching fittings — not to measure what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions1.
- 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.
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 and other plumbing areas 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).
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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1547160
