Ultimate Heat Pump Water Heater Comparison Review 2025

Feb 19, 2025

Choosing the Right Heat Pump for Your Home

When it comes to energy-efficient hot water, choosing the right heat pump water heater can save you thousands in electricity bills while providing consistent hot water year-round. But with so many brands and models available, how do you know which one is best for your home?

At JR Gas & Water, we’ve reviewed and ranked the top heat pump water heaters based on efficiency, cost, longevity, after-sales support, brand reputation, noise levels, servicing needs, and refrigerant type.

After rigorous testing and analysis, here’s our 2025 heat pump water heater showdown! 🚀

🥇 1. Rheem Ambipower 280 – Best Overall Performer

🥈 2. Rheem Ambiheat 270 – Best for Energy Efficiency

🥉 3. Stiebel WWK 302H – Best for German Engineering & Durability

4. Stiebel WWK 302 – Best for Cold Climates

5. Envirosun M9 330L – Best for Large Families

6. EvoHeat 270 – Best for High Efficiency & Smart Features

7. Reclaim 315L (V2 Stainless) – Best for Sustainability (CO₂ Refrigerant)

8. Reclaim 315L (V2 Standard Steel) – Best Budget CO₂ Heat Pump

9. Emerald Planet 270 – Best for Affordable Performance

10. iStore 270L – Best for Compact Homes & Versatility

How We Ranked These Heat Pumps

We evaluated each model based on 10 key factors, but we gave double weight to three of the most important categories:

Longevity (How long the unit lasts – crucial for long-term savings)
Initial Installation Cost (Upfront affordability)
After-Sales Support (Warranty and service availability)

These factors directly impact your satisfaction and cost over time. The final score is an average of all categories, with weighted factors included. Note if say the unit doesn't have a longevity score at this stage we gave it a 3.

🥇 1. Rheem Ambipower 280 – Best Overall Performer

Score: ⭐3.90
Energy Efficiency (COP): ★★★★☆ (3.8-4.2)
Initial Install Cost: ⭐⭐⭐⭐☆ (Medium)
Longevity: ⭐⭐⭐⭐☆ (Long-lasting)
After-Sales Support: ⭐⭐⭐⭐⭐ (Industry-leading support)
Brand Reputation: ⭐⭐⭐⭐⭐ (Trusted, proven brand)
Noise Levels: ~48 dB (Quiet operation)
Special Features: Eco-friendly, smart controller, high efficiency
Servicing Needs: ⭐⭐⭐⭐☆ (Low maintenance)
Refrigerant Type: R410A
Best For: Families looking for reliability and long-term value

Why We Chose It as #1

The Rheem Ambipower 280 stands out as the best all-rounder because of its impressive energy efficiency, moderate initial cost, and strong warranty support. Unlike some competitors, it offers one of the most efficient heating performances while keeping energy consumption low. The smart controller enhances usability, allowing you to customize settings for maximum savings. Plus, Rheem’s after-sales support is one of the best in the industry, making this a solid investment for long-term use.

Pros: ✔️ High efficiency reduces power bills
✔️ Reliable after-sales service ensures long-term satisfaction
✔️ Quiet operation compared to many competitors
✔️ Smart controller allows better energy management
✔️ Proven brand reputation in Australia

Cons: ❌ Not the cheapest upfront option ❌ Slightly bulkier than ultra-compact models

Who Should Buy It? If you want a balance between performance, price, and support, the Ambipower 280 is the best choice for households looking for consistent hot water with low energy consumption.

🥈 2. Rheem Ambiheat 270 – Best for Energy Efficiency

Score: ⭐3.87
Energy Efficiency (COP): ★★★★☆ (3.6-4.0)
Initial Install Cost: ⭐⭐⭐☆ (Moderate)
Longevity: ⭐⭐⭐⭐⭐ (Durable)
After-Sales Support: ⭐⭐⭐⭐⭐ (Excellent)
Brand Reputation: ⭐⭐⭐⭐⭐ (Highly rated)
Noise Levels: ~49 dB
Special Features: Smart controller, efficient heat exchange
Servicing Needs: ⭐⭐⭐⭐☆ (Low maintenance)
Refrigerant Type: R410A
Best For: Households that prioritize efficiency and reliability

Why We Chose It as #2

The Rheem Ambiheat 270 is a standout option for energy-conscious households looking for high efficiency and reliability. With a durable build and an excellent reputation, it’s designed to handle varying Australian climates with consistent performance. The smart controller optimizes energy usage, reducing electricity bills while maintaining superior heating efficiency.

Pros: ✔️ Energy-efficient design reduces electricity usage
✔️ Reliable after-sales support ensures peace of mind
✔️ Smart controller for optimized heat pump performance
✔️ Durable construction for long-term reliability
✔️ Proven Rheem brand reputation

Cons: ❌ Slightly higher upfront cost than some models
❌ Bulkier size may require more installation space

Who Should Buy It? If you prioritize energy savings and durability, the Rheem Ambiheat 270 is an excellent choice for homeowners looking for a balance of efficiency, longevity, and performance.

🥉 3. Stiebel WWK 302H – Best for German Engineering & Durability

Score: ⭐3.86
Energy Efficiency (COP): ★★★★☆ (3.5-4.0)
Initial Install Cost: ⭐⭐⭐☆ (Moderate)
Longevity: ⭐⭐⭐⭐⭐ (Very durable)
After-Sales Support: ⭐⭐⭐⭐⭐ (Reliable service)
Brand Reputation: ⭐⭐⭐⭐⭐ (Renowned for quality)
Noise Levels: ~49 dB
Special Features: Hybrid model, faster heat recovery
Servicing Needs: ⭐⭐⭐⭐☆ (Low maintenance)
Refrigerant Type: R134a
Best For: Those who value longevity over upfront cost

Why We Chose It as #3

The Stiebel WWK 302H is a top-tier German-engineered heat pump designed for maximum durability and efficiency. Its hybrid model enhances heat recovery speed, ensuring consistent hot water even in demanding conditions. With strong after-sales support and a trusted brand reputation, this unit is built to last, making it a great choice for those who prioritize longevity and reliability.

Pros: ✔️ Hybrid technology speeds up heat recovery
✔️ Reliable after-sales service for long-term peace of mind
✔️ Durable German-engineered construction
✔️ Energy-efficient operation
✔️ Well-known brand with strong reputation

Cons: ❌ Moderate initial cost, not the cheapest option
❌ Slightly bulkier design compared to compact models

Who Should Buy It? If you want a durable and efficient heat pump from a highly trusted German brand, the Stiebel WWK 302H is a fantastic investment for those who prioritize long-term reliability over initial cost.

4. Stiebel WWK 302 – Best for Cold Climates

Score: ⭐3.86
Energy Efficiency (COP): ★★★★☆ (3.5-4.0)
Initial Install Cost: ⭐⭐⭐☆ (Moderate)
Longevity: ⭐⭐⭐⭐⭐ (Durable)
After-Sales Support: ⭐⭐⭐⭐⭐ (Excellent)
Brand Reputation: ⭐⭐⭐⭐⭐ (Trusted German brand)
Noise Levels: ~49 dB
Special Features: Frost protection, reliable performance in colder temperatures
Servicing Needs: ⭐⭐⭐⭐☆ (Low maintenance)
Refrigerant Type: R134a
Best For: Homes in colder climates needing efficiency

Why We Chose It as #4

The Stiebel WWK 302 is a strong performer, particularly in cold climates, where its frost protection feature ensures reliable operation even in low temperatures. Built with German engineering, this model is known for its longevity and consistent heating performance, making it an excellent investment for households dealing with varying seasonal temperatures.

Pros: ✔️ Frost protection ensures year-round efficiency
✔️ Highly durable with a strong brand reputation
✔️ Energy-efficient performance
✔️ Reliable after-sales support
✔️ Low maintenance requirements

Cons: ❌ Higher initial cost than some competitors
❌ Slightly bulkier unit requiring more installation space

Who Should Buy It? If you live in an area with colder temperatures and need a highly efficient, durable heat pump, the Stiebel WWK 302 is a top-tier option that guarantees consistent hot water supply regardless of the climate.

5. Envirosun M9 330L – Best for Large Families

Score: ⭐3.56
Energy Efficiency (COP): ★★★★☆ (3.7-4.2)
Initial Install Cost: ⭐⭐⭐⭐⭐ (High)
Longevity: ⭐⭐⭐☆ (Moderate)
After-Sales Support: ⭐⭐⭐☆ (Decent but not exceptional)
Brand Reputation: ⭐⭐⭐☆ (Mid-tier brand)
Noise Levels: ~50 dB
Special Features: Large storage capacity, great for high-demand households
Servicing Needs: ⭐⭐⭐☆ (Moderate maintenance required)
Refrigerant Type: R134a
Best For: Large households with high hot water demand

Why We Chose It as #5

The Envirosun M9 330L is built for big families or shared households that need a large storage capacity for consistent hot water supply. While it comes with a higher initial cost, it compensates with great efficiency and robust construction. The brand reputation isn’t as high as Rheem or Stiebel, but it’s still a reliable mid-tier choice.

Pros: ✔️ Massive 330L capacity – ideal for families
✔️ Decent efficiency rating for a larger system
✔️ Handles high hot water demand without issues
✔️ Durable build for long-term use

Cons: ❌ Higher upfront cost than smaller models
❌ Brand reputation isn't as strong as top competitors
❌ Moderate servicing needs – occasional maintenance required

Who Should Buy It? If you have a large family or multiple people in your household, the Envirosun M9 330L ensures hot water supply never runs out, making it a great investment despite the higher upfront cost.

6. iStore 270L – Best for Compact Homes & Versatility

Score: ⭐3.33
Energy Efficiency (COP): ★★★★☆ (3.6-4.5)
Initial Install Cost: ⭐⭐⭐⭐☆ (Medium)
Longevity: ⭐⭐⭐⭐☆ (Durable)
After-Sales Support: ⭐⭐⭐⭐☆ (Reliable service)
Brand Reputation: ⭐⭐⭐⭐☆ (Well-regarded in Australia)
Noise Levels: ~48 dB
Special Features: Smart controller, multiple operation modes for energy savings
Servicing Needs: ⭐⭐⭐⭐☆ (Low maintenance)
Refrigerant Type: R290 (Natural, Low GWP)
Best For: Households needing a space-saving, efficient heat pump

Why We Chose It as #6

The iStore 270L stands out due to its compact size and high versatility, making it ideal for smaller homes or apartments that still require a reliable hot water system. It offers multiple energy-saving modes to adapt to different usage patterns, maximizing efficiency while keeping power consumption low. With a well-regarded brand reputation in Australia, this unit offers solid durability at a reasonable price.

Pros: ✔️ Space-efficient design for small homes
✔️ Smart operation modes for flexible energy use
✔️ Moderate pricing with great efficiency
✔️ Quiet operation compared to other models
✔️ Natural refrigerant (R290) with low environmental impact

Cons: ❌ Not as high capacity as some larger models
❌ Slightly less known brand compared to Rheem and Stiebel

Who Should Buy It? If you need a compact yet powerful heat pump that balances energy efficiency, quiet operation, and cost-effectiveness, the iStore 270L is an excellent choice for modern homes.

7. Emerald Planet 270 – Best for Affordable Performance

Weighted Score: ⭐3.2
Energy Efficiency (COP): ★★★★☆ (3.6-4.0)
Initial Install Cost: ⭐⭐⭐⭐☆ (Moderate)
Longevity: ⭐⭐⭐☆☆ (Decent lifespan)
After-Sales Support: ⭐⭐⭐⭐☆ (Good service network)
Brand Reputation: ⭐⭐⭐☆ (Growing market presence)
Noise Levels: ~48 dB
Special Features: High efficiency, cost-effective, solid warranty
Servicing Needs: ⭐⭐⭐⭐☆ (Low maintenance)
Refrigerant Type: R290 (Natural, Low GWP)
Best For: Homeowners seeking an efficient and budget-friendly heat pump

Why We Chose It as #7

The Emerald Planet 270 is an affordable yet highly efficient heat pump, offering a strong balance of cost and performance. It features R290 refrigerant, known for its low environmental impact and excellent energy efficiency. While it doesn’t have the same brand recognition as Rheem or Stiebel, it provides solid after-sales support and warranty coverage, making it a good budget-friendly alternative.

Pros: ✔️ Cost-effective without sacrificing efficiency
✔️ Uses R290 refrigerant for eco-friendly operation
✔️ Moderate noise levels compared to other models
✔️ Reliable warranty and after-sales support
✔️ Low maintenance needs

Cons: ❌ Less brand recognition compared to premium models
❌ Slightly shorter lifespan than higher-end heat pumps
❌ Not the most silent option available

Who Should Buy It? If you’re looking for an affordable, efficient, and environmentally friendly heat pump, the Emerald Planet 270 is a great option that balances cost and long-term savings.

8. Reclaim 315L (V2 Stainless) – Best for Sustainability (CO₂ Refrigerant)

Score: ⭐2.88
Energy Efficiency (COP): ★★★★★ (4.8-5.0)
Initial Install Cost: ⭐⭐☆☆☆ (Higher upfront cost)
Longevity: ⭐⭐⭐☆☆ (Moderate lifespan)
After-Sales Support: ⭐⭐⭐☆☆ (Decent support)
Brand Reputation: ⭐⭐⭐⭐⭐ (Highly trusted in eco-friendly solutions)
Noise Levels: ~37 dB (Quietest model)
Special Features: CO₂ refrigerant, ultra-efficient, ideal for environmentally conscious buyers
Servicing Needs: ⭐⭐⭐☆☆ (Moderate maintenance required)
Refrigerant Type: CO₂ (R744, eco-friendly refrigerant with low GWP)
Best For: Homeowners looking for the most energy-efficient and sustainable heat pump

Why We Chose It as #8

The Reclaim 315L (V2 Stainless) is the best option for environmentally conscious consumers looking for maximum efficiency and sustainability. Using CO₂ (R744) refrigerant, it has one of the lowest global warming potentials (GWP) among heat pumps, making it an excellent choice for reducing carbon footprint. Its stainless steel build enhances durability, and it operates at an ultra-quiet 37 dB, making it one of the most silent heat pumps available.

Pros: ✔️ Best-in-class energy efficiency with a COP of 4.8-5.0
✔️ Environmentally friendly CO₂ refrigerant
✔️ Extremely quiet operation
✔️ Durable stainless steel construction

Cons: ❌ Higher upfront cost than standard heat pumps
❌ Moderate servicing needs compared to other models

9. Reclaim 315L (V2 Standard Steel) – Best Budget CO₂ Heat Pump

Score: ⭐2.77
Energy Efficiency (COP): ★★★★★ (4.8-5.0)
Initial Install Cost: ⭐⭐☆☆☆ (Higher upfront cost)
Longevity: ⭐⭐⭐☆☆ (Moderate lifespan)
After-Sales Support: ⭐⭐⭐☆☆ (Decent support)
Brand Reputation: ⭐⭐⭐⭐⭐ (Highly trusted in eco-friendly solutions)
Noise Levels: ~37 dB (Quietest model)
Special Features: CO₂ refrigerant, ultra-efficient, budget-friendly alternative to stainless model
Servicing Needs: ⭐⭐⭐☆☆ (Moderate maintenance required)
Refrigerant Type: CO₂ (R744, eco-friendly refrigerant with low GWP)
Best For: Homeowners looking for a cost-effective, sustainable heat pump

Why We Chose It as #8

The Reclaim 315L (V2 Standard Steel) provides the same ultra-efficient CO₂ refrigerant technology as its stainless counterpart, but at a lower cost. It offers top-tier energy efficiency, making it a great investment for eco-conscious homeowners who want to reduce carbon footprint while saving on running costs. Though it has a slightly lower durability rating compared to the stainless model, it still provides excellent performance and efficiency.

Pros: ✔️ Top-tier energy efficiency (COP 4.8-5.0)
✔️ Budget-friendly alternative to stainless model
✔️ Extremely quiet operation
✔️ Eco-friendly CO₂ refrigerant with low GWP
✔️ Reliable brand reputation

Cons: ❌ Higher upfront cost than traditional heat pumps
❌ Slightly lower durability compared to stainless steel version
❌ Moderate servicing needs

Who Should Buy It? If you’re looking for a highly efficient, environmentally friendly heat pump but want a more budget-conscious option compared to the stainless steel version, the Reclaim 315L (V2 Standard Steel) is a fantastic choice for long-term energy savings.

10. Rinnai Enviroflo 315 – Best for Large Family Homes

Weighted Score: ⭐4.1
Energy Efficiency (COP): ★★★★☆ (3.5-4.0)
Initial Install Cost: ⭐⭐⭐☆ (Moderate)
Longevity: ⭐⭐⭐⭐☆ (Reliable and durable)
After-Sales Support: ⭐⭐⭐⭐☆ (Good customer service)
Brand Reputation: ⭐⭐⭐⭐⭐ (Trusted Australian brand)
Noise Levels: ~50 dB
Special Features: Large capacity, reliable performance, efficient operation
Servicing Needs: ⭐⭐⭐☆ (Moderate maintenance required)
Refrigerant Type: R134a
Best For: Large households needing ample hot water supply

Why We Chose It as #10

The Rinnai Enviroflo 315 is a high-capacity heat pump designed to provide hot water for large families without sacrificing efficiency. As one of the more affordable large-unit options, it delivers solid performance, durability, and brand reliability. While its maintenance needs are slightly higher than some competitors, it remains a strong choice for households needing a consistent hot water supply.

Pros: ✔️ Large 315L capacity – ideal for big families
✔️ Reliable performance with strong after-sales support
✔️ Moderate efficiency at a competitive price
✔️ Well-known, trusted Australian brand

Cons: ❌ Higher noise levels compared to compact models
❌ Moderate servicing needs – occasional maintenance required

Who Should Buy It? If you have a large household and need a cost-effective, high-capacity heat pump, the Rinnai Enviroflo 315 is a great choice that ensures your family never runs out of hot water.

11-15 Rankings: Additional Heat Pumps to Consider

While the top 10 heat pumps offer some of the best options in terms of efficiency, affordability, and reliability, there are other models worth considering, depending on your needs and budget. Here’s how they rank:

11. Rinnai E-Series 265 – Best for Mid-Tier Reliability

Weighted Score: ⭐3.31
Why Consider It? A solid mid-range option with decent efficiency and brand reputation, but lacks the standout features of higher-ranked models.

12. Hydrotherm Dynamix X8 – Best for Budget-Conscious Buyers

Weighted Score: ⭐2.64
Why Consider It? A lower-cost heat pump with moderate efficiency and a simple design, though it requires regular maintenance.

13. EvoHeat 270 – Best for Cost-Effective Performance

Weighted Score: ⭐2.22
Why Consider It? Offers smart technology and efficiency features but has a shorter lifespan compared to premium models.

14. Quantum 270 – Best for Harsh Weather Conditions

Weighted Score: ⭐2.20
Why Consider It? Designed to work well in colder climates, but higher noise levels and servicing needs affect its ranking.

15. Dux Airoheat 250 – Best for Basic Functionality

Weighted Score: ⭐1.97
Why Consider It? One of the most budget-friendly options, but lacks long-term durability and has higher servicing needs.

While these models may not be the best overall, they still offer decent performance at a lower cost for those looking for affordable heat pump solutions.

Final Thoughts: Choosing the Best Heat Pump for Your Needs

Selecting the right heat pump water heater depends on your budget, household size, energy efficiency goals, and maintenance expectations. Our rankings provide a detailed breakdown of the best options available in 2025, ensuring you make a smart investment for long-term energy savings and reliability.

Top Recommendations:

✅ Best Overall Performer: Rheem Ambipower 280 – Best balance of efficiency, durability, and support.
✅ Best for Energy Efficiency: Rheem Ambiheat 270 – Designed for optimal energy savings.
✅ Best for Large Families: Rinnai Enviroflo 315 – High-capacity model ideal for bigger households.
✅ Best for Sustainability: Reclaim 315L Stainless & Standard Steel – Leading CO₂-based eco-friendly options.
✅ Best Budget Option: Enviroheat M9 330 – Affordable without compromising efficiency.

At JR Gas & Water, we offer expert installation services and competitive pricing on all major heat pump models. Our team is here to help you choose the best water heating solution for your home.