Description
Free Shipping, or Pickup. We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
The Rheem RPH028-3A 28kW Three-Phase delivers the same powerful heating output as the single-phase 28kW model, but draws current across three phases — making it the smarter choice for large residential pools where three-phase power is available. Lower current per phase means a smaller circuit breaker, less load on the electrical infrastructure, and easier integration with other three-phase equipment. Backed by Rheem's national service network and one of the strongest warranties on the Australian market.
Rheem is one of Australia's most recognised names in water heating, and Rheem Thermal is a long-established specialist in pool and spa heating for residential and commercial applications. The Compact Residential Inverter Series combines modern inverter efficiency, quiet operation, WiFi control, strong build quality, and one of the best warranty structures in the market.
At a Glance — 28kW 3-Phase (RPH028-3A)
- Heating capacity: 27.8 kW (at 27°C air / 27°C water)
- Average COP at 50% speed: 10.7
- Power supply: 415V three phase
- Recommended circuit breaker: 10A
- Sound level at 10m: 21.5-32.9 dB(A)
- Operating air range: -10°C to +43°C
- Refrigerant: R32 (2.0 kg)
- Advised water flow: 2.8-3.4 L/sec
- Dimensions (L × W × H): 1060 × 430 × 957 mm
- Net weight: 99 kg
- Water connections: 50mm
Best suited to large residential pools with three-phase power available. For commercial or oversized residential installations needing more output, also consider the 35kW three-phase model. For single-phase properties, see the 28kW single-phase variant.
Why We Like Rheem Heat Pumps
- Excellent national backup support from a brand Australians already know and trust
- Heating and cooling capability for better year-round pool and spa comfort
- Built-in WiFi control via app connectivity
- Compact footprint for installations where space matters
- Quiet inverter operation with advanced EC fan motor technology
- High temperature settings for spa applications
- Ready integration with pool automation systems
Warranty Support That Actually Means Something
Not all warranties are equal. Rheem backs the Compact Series with its National Service Network, which is a major advantage over many lesser-known import brands.
- 3 year parts and labour warranty
- 5 years on general parts
- 10 years on the compressor
- 25 years on the heat exchanger
One standout warranty feature: if the heat exchanger fails within the 3 year comprehensive warranty period, Rheem states they will replace the heater at no cost. That is a serious level of support and one of the strongest warranty offers available in this category.
Key Features (All Models)
- Twin rotary stepless DC inverter compressor for efficient, precise output control
- EC fan motor for quiet operation and improved efficiency
- Electronic Expansion Valve (EEV) for increased temperature stability
- Twisted titanium heat exchanger for effective heat transfer and corrosion resistance
- Advanced reverse cycle defrosting for improved cold-weather operation
- R32 refrigerant with lower global warming impact than older refrigerants
- Durable ABS and aluminium alloy casing for outdoor durability
- Single point condensate drain with factory supplied drain kit
- Heavy duty weather cover to help keep the unit clean when not in use
- 50mm water connections
Control and Automation
- Easy-use LCD touchscreen with lock function
- WiFi enabled for remote control through a compatible app
- Suitable for spa temperature settings
- Can integrate with automation systems
- Easy connection to the Rheem DPi Link for automated pump control
Australian Compliance and Peace of Mind
These units are independently certified in Australia to comply with Australian Electrical Safety Standards.
- Certified to AS/NZS 60335-1
- Certified to AS/NZS 60335-2-40
Why Buy From Us
- Authorised Australian supplier
- Physical stock for fastest dispatch or local collection
- Real-world product knowledge in pool and spa heating
Full Range Comparison — Rheem Compact Residential Inverter Series
| Model | RPH009-1A | RPH013-1A | RPH016-1A | RPH021-1A | RPH028-1A | RPH028-3A | RPH035-3A |
|---|---|---|---|---|---|---|---|
| Heating Performance Condition: Air 27°C / Water 27°C / Humidity 80% | |||||||
| Heating Capacity (kW) | 8.6 | 13 | 15.5 | 21 | 27.8 | 27.8 | 35.0 |
| Average COP at 50% Speed | 9.0 | 9.5 | 9.6 | 9.3 | 11.0 | 10.7 | 10.6 |
| Technical Specifications | |||||||
| Power supply | 240V 1Ph | 415V 3Ph | |||||
| Recommended circuit breaker size (A) | 10 | 16 | 20 | 25 | 25 | 10 | 20 |
| Refrigerant R32 charge (kg) | 0.5 | 0.75 | 0.8 | 1.0 | 2.0 | 2.0 | 2.0 |
| Dimensions L / W / H (mm) | 890 / 430 / 657 | 890 / 430 / 657 | 890 / 430 / 657 | 1060 / 430 / 657 | 1060 / 430 / 957 | 1060 / 430 / 957 | 1314 / 512 / 957 |
| Net weight (kg) | 58 | 61 | 64 | 70 | 94 | 99 | 132 |
For a side-by-side overview of every size in this range (9kW through 35kW), see the Rheem Compact Inverter Series — Range Overview.