🌊 Hayward Micro 3.5kW Plug & Play Heat Pump for Small Pools | HP2031DT3C

Transform your above-ground or small in-ground pool into a warm oasis with the Hayward Micro heat pump – the smart, energy-efficient heating solution that’s ready to use straight out of the box.

Are you tired of cold pool water limiting your swimming season? The Hayward Micro HP2031DT3C offers a perfect combination of compact design, powerful heating performance, and effortless plug-and-play installation. Designed specifically for smaller pools up to 15-20m³, this 3.5kW heat pump delivers reliable warmth while using up to 5 times less energy than traditional electric heaters.

💡 Why Choose the Hayward Micro Heat Pump?

✅ No Complex Installation – Simply plug into a standard 230V outlet and connect to your pool system

✅ Energy Efficient – COP rating of 5.12 means incredible heating performance at minimal cost

✅ Smart Control – Manage temperature, schedules, and settings via Bluetooth app from anywhere

✅ Ultra-Quiet Operation – At just 48dB, it’s quieter than normal conversation

✅ Compact Design – Perfect for limited spaces around above-ground and small pools

✅ Durable Construction – Titanium heat exchanger withstands harsh pool chemicals

✅ Eco-Friendly R32 Refrigerant – Lower environmental impact than older refrigerants

🎯 Perfect For

• Above-ground pools (family-sized, 12-20m³)
• Small in-ground pools (plunge pools, compact designs)
• Swim spas and hot tubs
• Small water features requiring consistent temperature
• Seasonal pool users looking to extend their swimming season

📊 Complete Technical Specifications

Specification	Detail
Model Number	HP2031DT3C
Heating Capacity	3.5kW (11,945 BTU/h)
Power Supply	230V / 1-Phase / 50Hz
Suitable Pool Size	Up to 15-20m³ (3,300-4,400 gallons)
COP (Coefficient of Performance)	5.12 at 27°C air / 26°C water
Power Consumption	0.68kW
Current Draw	2.95A
Operating Air Temperature Range	10°C to 43°C (50°F to 109°F)
Noise Level	<48dB(A) at 1 meter
Refrigerant Type	R32 (eco-friendly)
Compressor Type	Rotary
Heat Exchanger Material	Titanium (corrosion-resistant)
Water Connections	32mm / 38mm (1.25″ / 1.5″)
Recommended Water Flow	1.6 m³/h
Protection Rating	IPX4 (splash-proof)
Control System	Digital display + Bluetooth app
Fan Type	Axial, 700 RPM
Operating Mode	Heating only
Warranty	1 year manufacturer warranty
Weight	Compact design (refer to installation guide)
Dimensions	Space-saving footprint

📥 Downloads & Documentation

📄 Hayward Heat Pump General Installation Guide (opens in new tab) Comprehensive installation and operation manual for Hayward heat pump systems. Includes safety instructions, plumbing requirements, electrical connections, and maintenance guidelines.

📄 Hayward HeatPro Techsheet PDF

⚠️ Important Note: Heat pump comes with hosetails but hose increment not included. You will need to purchase separately for 1.25″ or 1.5″ connections.

🔥 Key Features & Benefits

🔌 Plug-and-Play Convenience

Forget complicated electrical installations. The Hayward Micro connects to any standard 230V household outlet, making it the easiest heat pump to install. No electrician required for basic setup – just plug in, connect your water lines, and start heating.

📱 Bluetooth App Control

Control your pool temperature from the comfort of your home. The dedicated smartphone app allows you to:

• Adjust target water temperature
• Set heating schedules and timers
• Monitor current pool temperature
• Turn the unit on/off remotely
• View operating status and diagnostics

💰 Exceptional Energy Efficiency

With a COP (Coefficient of Performance) of 5.12, the Hayward Micro delivers over 5kW of heating for every 1kW of electricity consumed. This means:

• Up to 80% lower running costs compared to traditional electric heaters
• Environmentally friendly operation
• Lower carbon footprint
• Cost-effective season extension

🔇 Whisper-Quiet Operation

At less than 48dB, the Hayward Micro is quieter than:

• Normal conversation (60dB)
• Your pool filter pump
• Background music
• Distant traffic

You’ll barely notice it’s running, making it perfect for residential settings and noise-sensitive areas.

🛡️ Built to Last

Titanium heat exchanger resists corrosion from chlorine, salt, and pool chemicals, ensuring long-term reliability and performance. The galvanized black painted casing provides additional protection against the elements and includes built-in acoustic insulation.

🌡️ Wide Operating Range

Functions efficiently in ambient temperatures from 10°C to 43°C, allowing you to heat your pool from early spring through late autumn in most UK climates.

🏊 Pool Sizing Guide & Suitability

Ideal Pool Volumes:

Pool Type	Volume Range	Suitability
Small Above-Ground Pools	10-15m³ (2,200-3,300 gal)	✅ Excellent
Medium Above-Ground Pools	15-20m³ (3,300-4,400 gal)	✅ Good
Plunge Pools / Spools	8-15m³ (1,750-3,300 gal)	✅ Excellent
Small In-Ground Pools	Up to 20m³ (4,400 gal)	✅ Good
Swim Spas (Small)	8-12m³ (1,750-2,650 gal)	✅ Excellent
Large Pools	Over 20m³ (4,400+ gal)	❌ Too Small

💡 Pro Tip: For pools at the upper end of the capacity range (18-20m³), expect longer heat-up times and consider using a pool cover to maintain temperature efficiently.

⏱️ Heat-Up Time Estimates

How long will it take to heat my pool?

Below are estimated heat-up times based on the Hayward Micro’s 3.5kW output. Actual times will vary based on ambient air temperature, starting water temperature, wind conditions, and pool insulation.

Standard Heat-Up Times (from 15°C to target temperature)

Pool Volume	To 22°C (+7°C)	To 26°C (+11°C)	To 28°C (+13°C)
10m³ (2,200 gal)	23 hours	36 hours	42 hours
12m³ (2,650 gal)	28 hours	43 hours	51 hours
15m³ (3,300 gal)	35 hours	54 hours	63 hours
18m³ (4,000 gal)	42 hours	65 hours	76 hours
20m³ (4,400 gal)	47 hours	72 hours	85 hours

Faster Heat-Up (from 18°C to target temperature)

Pool Volume	To 24°C (+6°C)	To 26°C (+8°C)	To 28°C (+10°C)
10m³	20 hours	26 hours	33 hours
12m³	24 hours	32 hours	39 hours
15m³	30 hours	40 hours	49 hours
18m³	36 hours	47 hours	59 hours
20m³	40 hours	53 hours	65 hours

⚠️ Important Notes:

• Times based on optimal conditions: 27°C ambient air temperature, 80% humidity
• Performance reduces in cooler weather (expect 20-40% longer in 15-20°C ambient)
• Heat-up times assume continuous operation with pool covered when not in use
• Using a solar cover reduces heat loss by up to 75% and significantly improves efficiency
• Initial heat-up is longest; daily top-up heating typically requires only 2-4 hours

Formula Used: Time (hours) = (Pool Volume m³ × Temperature Rise °C × 1.16) ÷ Heat Pump kW Rating

💵 Running Cost Comparison

How much does it cost to heat my pool?

Based on UK average electricity rates of £0.24 per kWh (2024):

Heating Method	Power Consumption	Cost per Hour	Daily Cost (8hrs)	Weekly Cost
Hayward Micro 3.5kW Heat Pump	0.68kW	£0.16	£1.30	£9.10
3kW Electric Heater	3.0kW	£0.72	£5.76	£40.32
6kW Electric Heater	6.0kW	£1.44	£11.52	£80.64
Gas Pool Heater (100,000 BTU)	~29kW equivalent	~£2.00	£16.00	£112.00

💰 Annual Savings: Using the Hayward Micro instead of a 3kW electric heater during a 6-month pool season (May-October) could save you over £750 per year in heating costs.

🛠️ Installation Requirements

Location & Placement

✅ Outdoor installation only – requires good air circulation ✅ Level, stable surface (concrete pad or reinforced base recommended) ✅ Minimum clearances:

• 60cm (2 feet) from walls, fences, or obstacles on all sides
• 2m (6 feet) clear space above unit
• Away from recirculating air from discharge outlet ✅ Not under eaves, decks, or porches (prevents air recirculation) ✅ Away from sprinkler systems (especially with fertilizers)

Electrical Requirements

• Standard 230V household outlet (13A fused plug)
• Dedicated circuit recommended (not shared with other heavy appliances)
• RCD protection (residual current device) for safety
• Accessible power switch for easy shut-off

Plumbing Connections

• 32mm or 38mm (1.25″ or 1.5″) water connections
• Compatible with standard pool hose fittings
• Hosetails included (hose increment sold separately)
• Install after pool filter and before return to pool
• Ensure adequate water flow: 1.6 m³/h recommended
• Consider installing isolation valves for easy maintenance

Additional Considerations

• Drainage – position to allow condensate water drainage
• Pool cover recommended – reduces heat loss and improves efficiency
• Frost protection – built-in protection activates at low temperatures
• Professional installation advised for optimal performance

🌍 Environmental & Seasonal Performance

R32 Refrigerant Benefits

The Hayward Micro uses R32 refrigerant, a next-generation cooling agent that offers:

• 68% lower global warming potential than R410A
• More efficient heat transfer properties
• Better performance in varying conditions
• Future-proof compliance with environmental regulations

Seasonal Performance Expectations

🌞 Summer (June-August):

• Best performance period
• COP up to 5.12 in warm weather
• Rapid heat-up times
• Lowest running costs
• Can maintain 28°C comfortably

🍂 Spring/Autumn (April-May, September-October):

• Good performance in 15-20°C ambient
• COP reduces to 3.5-4.0
• Longer heat-up times
• Pool cover essential for efficiency
• Ideal for extending swimming season

❄️ Winter (November-March):

• Limited operation below 10°C ambient
• Built-in frost protection activates
• Not recommended for primary heating
• Best used for winterization protection only

❓ Frequently Asked Questions

Q: Can I install the Hayward Micro myself?

A: Yes! The plug-and-play design makes DIY installation straightforward for most homeowners. You’ll need basic plumbing skills to connect the water lines (32mm/38mm) and access to a standard 230V outdoor outlet. However, for optimal performance and warranty compliance, professional installation is recommended.

Q: Will this heat pump work with my above-ground pool?

A: Absolutely! The Hayward Micro is specifically designed for above-ground pools up to 15-20m³. It’s perfect for typical family-sized above-ground pools (12-18 feet diameter). Just ensure your pool volume falls within the recommended range for best results.

Q: How much electricity does it use per day?

A: The unit draws only 0.68kW of power while running. If operating 8 hours per day, it consumes approximately 5.44kWh daily, costing around £1.30 per day (based on £0.24/kWh). This is up to 80% cheaper than conventional electric heaters.

Q: Can I control it from my smartphone?

A: Yes! The Hayward Micro features Bluetooth connectivity and works with a dedicated free app. You can adjust temperature settings, set heating schedules, monitor current pool temperature, and turn the unit on/off remotely from your smartphone or tablet.

Q: How quiet is it really?

A: At less than 48dB, the Hayward Micro is quieter than normal conversation. Most users report they can barely hear it running from inside their home. It’s significantly quieter than your pool filter pump, making it ideal for residential areas with noise restrictions.

Q: What’s included in the box?

A: The package includes:

• Hayward Micro heat pump unit
• Hosetails for water connections (32mm/38mm)
• User manual and installation guide
• Bluetooth app setup instructions

Note: Hose increment adapters are NOT included and must be purchased separately if needed for your specific pool setup.

Q: Does it work in cold weather?

A: The unit operates in ambient temperatures from 10°C to 43°C. Below 10°C, built-in frost protection activates and performance is limited. For UK climates, expect excellent performance from April through October, with reduced efficiency in early spring and late autumn.

Q: How long does it take to heat my pool initially?

A: For a 15m³ pool, expect approximately:

• 35 hours to raise temperature by 7°C (e.g., 15°C to 22°C)
• 54 hours to raise by 11°C (e.g., 15°C to 26°C)

Times vary based on ambient temperature, starting water temperature, and whether you use a pool cover. Once at temperature, daily top-up heating typically requires only 2-4 hours.

Q: Will a pool cover make a difference?

A: Absolutely! A quality pool cover can:

• Reduce heat loss by up to 75%
• Cut heating costs by 50-70%
• Reduce heat-up times by 30-50%
• Minimize chemical evaporation We strongly recommend using a solar or thermal cover, especially overnight.

Q: Can I use this with a saltwater pool?

A: Yes! The titanium heat exchanger is highly resistant to corrosion from salt, chlorine, and other pool chemicals. This makes it suitable for both traditional chlorine pools and saltwater systems. Regular water chemistry maintenance is still recommended.

Q: What maintenance is required?

A: Minimal maintenance needed:

• Monthly: Clean air intake filter, check for debris around unit
• Seasonally: Inspect connections, clean exterior casing
• Annually: Professional service check recommended
• Winter: Drain water from heat exchanger if freezing temperatures expected

Q: Is there a warranty?

A: Yes, the Hayward Micro comes with a 1-year manufacturer warranty covering parts and workmanship defects. Keep your proof of purchase and ensure proper installation to maintain warranty validity.

Q: Can I run it 24/7?

A: While you can run it continuously, it’s not necessary. Most users run their heat pump 6-8 hours daily during pool season to maintain desired temperature. The built-in thermostat will cycle the unit on/off to maintain your set temperature. Use the app timer function to optimize running times for off-peak electricity rates.

✅ What You Get

🎁 Complete Package Includes:

• ✅ Hayward Micro 3.5kW Heat Pump (HP2031DT3C)
• ✅ 32mm/38mm hosetails for water connections
• ✅ Integrated Bluetooth control system
• ✅ Digital temperature display and control panel
• ✅ Free smartphone app access
• ✅ Frost protection system
• ✅ IPX4 weather-resistant housing
• ✅ User manual and installation guide
• ✅ 1-year manufacturer warranty

⚠️ Please Note: Hose increment adapters sold separately.

🚀 Ready to Extend Your Swimming Season?

The Hayward Micro 3.5kW Heat Pump represents the perfect balance of performance, efficiency, and value for small pool owners. With plug-and-play installation, smart Bluetooth control, and exceptional energy efficiency, it’s the easiest and most cost-effective way to enjoy warm, comfortable pool water from spring through autumn.

Key Advantages:

• ✅ 5x more efficient than electric heaters
• ✅ Save up to £750/year on heating costs
• ✅ No electrician required for installation
• ✅ Control from anywhere via smartphone app
• ✅ Ultra-quiet operation at <48dB
• ✅ Titanium heat exchanger for long-lasting durability

Perfect for pools 10-20m³ | Model HP2031DT3C

💡 Pro Installation Tip: For optimal efficiency, position the unit where it receives good airflow, install isolation valves for easy maintenance, and always use a pool cover when the pool is not in use. This simple combination can reduce your heating costs by up to 70%.

🌡️ Temperature Control Tip: Set your target temperature to 26-28°C for comfortable swimming. Each degree higher significantly increases running time and costs, while each degree lower saves energy.