Rheem RPH021-1A 21kW Pool Heat Pump Heater – PureSwim (Compact Series)
The Rheem RPH021-1A Compact Series is a high-output residential pool and spa heat pump designed for larger pool volumes, faster heat-up times, and extended swimming seasons. Supplied by PureSwim, this model is ideal for homeowners who want strong performance without stepping into oversized commercial equipment.
At the heart of the system is a twin rotary stepless DC inverter compressor, allowing the heat pump to vary output smoothly as conditions change. This helps maintain stable water temperature while operating efficiently across a wide range of climates. The robust outdoor cabinet is built to handle harsh environments, and the single-point condensate drain simplifies installation planning.
Do This First!
Which Size Pool Heater Do I Need?
Selecting the correct pool heater is the essential first step before exploring the range of pool heat pumps available. The ideal unit depends on several factors. Consider if you use a pool cover, your local climate, the season during which you plan to heat your pool and environmental conditions such as wind or shade. For instance, a small, well covered pool in a mild region may only require a 9kW unit. In contrast, a larger pool or one exposed to windy, cooler conditions might benefit from a 28kW heater for consistent performance throughout the year. To choose the perfect unit for your pool’s needs, try the Waterco pool heater calculator, to determine the optimal heater size and maximise energy efficiency and budget savings.
Find the Minimum Heat Output Required eg. 27KW/Hour
Then you would require a 27kW heater or higher.
Select The Pool Heaters You Would Like To View
Key Features – Rheem RPH021-1A Pool Heat Pump Heater
• 21kW Class Heating Output – Delivers 21kW heating at 27°C air / 27°C water conditions
• Efficient DC Inverter Technology – Adjusts performance to match demand and reduce energy use
• Twin Rotary Inverter Compressor – Stable temperature control with smooth operation
• LCD Touchscreen Controller – Simple, clear controls with lock function
• Built-in Wi-Fi Connectivity – Remote monitoring and control from your device
• Heating + Cooling Modes – Year-round temperature flexibility
• Quiet Residential Operation – Designed to minimise disruption around outdoor areas
• Automation Ready – Suitable for integration with automation and pump control setups
• Durable Outdoor Cabinet – Built to resist weather and corrosion
• Single-Point Condensate Drain – Cleaner, easier drainage setup
• R32 Refrigerant Platform – Modern refrigerant used across the series
• Strong Warranty Coverage – Long-term coverage on key components for peace of mind
Download the Invergo Heat Pump App
Take control of your pool heating system using the Invergo Heat Pump App. This smart mobile app puts your inverter pool heat pump at your fingertips. Download the Invergo Heat Pump App here to enjoy complete remote control of your pool heating system from anywhere via your smartphone.
Key Functions of the Wi-Fi Control
• Turn your pool heat pump on or off remotely
• Set and adjust your target water temperature
• Monitor operating status during heating and cooling
• Switch between modes such as Heating / Cooling / Auto
• Schedule run times using timer and automation settings
• Manage pool temperature from anywhere with an internet connection
The Rheem Compact Series includes built-in Wi-Fi connectivity for remote monitoring and control, making it easier to manage temperatures and optimise operating times.
Technical Specifications – Rheem RPH021-1A
• Model: Rheem RPH021-1A
• Series: Compact Residential Pool & Spa Heat Pump
• Heating Capacity: Up to 21kW
• Application: Residential swimming pools and spas
• Compressor: Twin rotary DC inverter
• Heat Exchanger: Titanium
• Control Interface: LCD touchscreen
• Connectivity: Built-in Wi-Fi connectivity for remote monitoring and control
• Construction: ABS and aluminium alloy casing
• Designed For: Australian conditions
• Warranty: 3-year parts and labour (residential use), 10-year compressor warranty, 25-year titanium heat exchanger warranty
Specification Sheet and Technical Parameters for the RPH Compact Inverter Series
| Model | RPH009-1A | RPH013-1A | RPH016-1A | RPH021-1A | RPH028-1A | RPH028-3A |
|---|---|---|---|---|---|---|
| HEATING PERFORMANCE CONDITION: Air at 27°C / Water 27°C / Humid. 80% | ||||||
| Heating Capacity (kW) | 8.6 | 13.0 | 15.5 | 21.0 | 27.8 | 27.8 |
| COP Range | 14~6.5 | 14~6.4 | 15~6.5 | 15~6.5 | 15.8~7.2 | 15.6~7.1 |
| Avg COP at 50% Speed | 9.0 | 9.5 | 9.6 | 9.3 | 11.0 | 10.7 |
| HEATING PERFORMANCE CONDITION: Air at 15°C / Water 26°C / Humid. 70% | ||||||
| Heating Capacity (kW) | 6.4 | 9.0 | 10.9 | 14.5 | 18.8 | 18.8 |
| COP Range | 6.8~4.5 | 7~4.4 | 7~4.5 | 7~4.6 | 7.8~4.9 | 7.8~4.9 |
| Avg COP at 50% Speed | 6.2 | 6.3 | 6.3 | 6.2 | 6.5 | 6.4 |
| HEATING PERFORMANCE CONDITION: Air at 5°C / Water 27°C / Humid. 60% | ||||||
| Heating Capacity (kW) | 4.6 | 6.3 | 7.7 | 9.8 | 12.9 | 12.9 |
| COP Range | 6.5~3.1 | 6.4~3.1 | 6.5~3.2 | 6.5~3.2 | 7.2~3.5 | 7.1~3.5 |
| Avg COP at 50% Speed | 4.3 | 4.4 | 4.3 | 4.2 | 4.6 | 4.6 |
| COOLING PERFORMANCE CONDITION: Air 35°C / Water 28°C / Humid. 80% | ||||||
| Cooling Capacity (kW) | 4.4 | 5.9 | 7.8 | 9.9 | 11.7 | 11.7 |
Technical Specifications
| Parameter | RPH009-1A | RPH013-1A | RPH016-1A | RPH021-1A | RPH028-1A | RPH028-3A |
|---|---|---|---|---|---|---|
| Operating air temp (°C) | -5°C~43°C | -5°C~43°C | -5°C~43°C | -5°C~43°C | -10°C~43°C | -10°C~43°C |
| Power supply | 240V 1Ph | 240V 1Ph | 415V 3Ph | |||
| Power Input (kW) | 0.21~1.42 | 0.31~2.10 | 0.37~2.42 | 0.47~3.20 | 0.50~3.84 | 0.5~3.84 |
| Current Input (A) | 0.93~6.20 | 1.34~8.90 | 1.60~10.60 | 2.06~13.70 | 2.17~16.70 | 0.72~5.56 |
| Circuit breaker (A) | 10 | 16 | 20 | 25 | 25 | 10 |
| Sound level at 10mtrs dBa | 19.0~28.4 | 22.2~30.8 | 21.2~34.4 | 23.4~34.1 | 21.5~32.9 | 21.5~32.9 |
| Sound level at 3mtrs dBa | 29.5~38.9 | 32.7~41.3 | 31.7~44.9 | 33.9~44.6 | 32.0~43.4 | 32.0~43.4 |
| Sound level at 50% speed 1mtr dBa | 41.6 | 45.8 | 45.9 | 46.8 | 46.4 | 47.0 |
| Protection Level | IPX4 | IPX4 | IPX4 | IPX4 | IPX4 | IPX4 |
| Refrigerant R32 charge (kg) | 0.5 | 0.75 | 0.8 | 1.0 | 2.0 | 2.0 |
| Operating pressure-discharge/suction | 4.1/0.15Mpa | 4.1/0.15Mpa | 4.1/0.15Mpa | 4.1/0.15Mpa | 4.1/0.15Mpa | 4.1/0.15Mpa |
| Target flow rate (L/sec) | 1.2 | 1.7 | 2.2 | 2.8 | 3.4 | 3.4 |
| Flow Rate Range (L/sec) | 0.5~1.2 | 1.2~1.7 | 1.6~2.2 | 2.0~2.8 | 2.8~3.4 | 2.8~3.4 |
| Temperature Differential (TD) @ 27/27/80 | 1.7 | 1.8 | 1.7 | 1.8 | 2.0 | 2.0 |
| Temperature Differential (TD) @ 15/26/70 | 1.3 | 1.3 | 1.2 | 1.2 | 1.3 | 1.3 |
| Water connections (mm) | 40 | 40 | 40 | 40 | 40 | 40 |
| Max allowable water pressure (kPa) | 300 | 300 | 300 | 300 | 300 | 300 |
| Net weight (Kg) | 58 | 61 | 64 | 70 | 94 | 99 |
| Gross weight packaged (Kg) | 67 | 70 | 72 | 80 | 103 | 108 |
1. The RPH009 and RHP016 are supplied with a power cord (without plug). These units may be installed by plug or hard-wired connection. All other models must be hard-wired.
2. TD Conditions are expressed as Entering Water Temperature/Ambient/Relative Humidity. TD is calculated with the compressor at its standard maximum operating Hz at the target water flow shown. TD will vary with all these variables.
3. Water unions suit 50mm OD high pressure PVC pipe, sometimes referred to as 40mm ID.
Version 4. March 2024
Dimensions
| Model | A (mm) | B (mm) | C (mm) | D (mm) | E (mm) | F (mm) | G (mm) | H (mm) | Packaged Dimensions (L x D x H) |
|---|---|---|---|---|---|---|---|---|---|
| RPH009-1A | 410 | 645 | 387 | 430 | 890 | 250 | 75 | 657 | 955 x 450 x 690 |
| RPH013-1A | 410 | 645 | 387 | 430 | 890 | 290 | 75 | 657 | 955 x 450 x 690 |
| RPH016-1A | 410 | 645 | 387 | 430 | 890 | 280 | 75 | 657 | 955 x 450 x 690 |
| RPH021-1A | 410 | 710 | 387 | 430 | 1060 | 390 | 75 | 657 | 1125 x 450 x 690 |
| RPH028-1A | 410 | 710 | 390 | 430 | 1060 | 640 | 75 | 957 | 1125 x 450 x 990 |
| RPH028-3A | 410 | 710 | 390 | 430 | 1060 | 640 | 75 | 957 | 1125 x 450 x 990 |
Note: The product pictures and dimensions above are specification diagrams for use by technician’s installers and for layout reference only.
Version 4. March 2024
Installation Guide (Rheem RPH Compact Inverter Series)
- • Select a well-ventilated outdoor location with adequate clearance for airflow and servicing, in line with local installation requirements
• Position the unit on a solid, level base and ensure it is stable and accessible for future maintenance
• Connect the plumbing to the pool return line as per the installation manual, ensuring the correct water flow direction and flow rate are maintained
• Fit the condensate drain to the single-point drain connection where required
• Have a licensed electrician connect the correct power supply (single phase or three phase where applicable) and ensure protection devices are installed as required
• Complete commissioning following the Rheem installation instructions, then set temperature and operating mode via the LCD touchscreen
• Connect the unit to your network and confirm built-in Wi-Fi connectivity for remote monitoring and control is working (where used)
• Before first operation, verify all water and electrical connections are secure and run an initial start-up check for normal operation
What’s in the Box
• Rheem RPH021-1A 21kW Pool Heat Pump Heater
• Installation manual and warranty documentation
• Accessory boxes containing mounting hardware and necessary union fittings and drainage kit.
• User manual with comprehensive installation and maintenance guidelines
