Key Specifications at a Glance
Full DC inverter pool heat pumps covering residential plunge pools to large commercial facilities.
How Pool Heat Pumps Work
A pool heat pump does not generate heat from scratch. It moves existing heat from the surrounding air into your pool water, delivering 5-7 times more thermal energy than the electricity it consumes.
1. Absorb Heat from Air
The DC fan draws ambient air across the evaporator coil, where R32 refrigerant absorbs thermal energy and evaporates at low temperature.
2. Compress and Amplify
The Panasonic DC inverter compressor raises the refrigerant temperature and pressure, concentrating the harvested energy into usable high-grade heat.
3. Transfer to Pool Water
Hot refrigerant passes through the titanium tube-in-shell heat exchanger, transferring heat directly to the circulating pool water safely and efficiently.
Advanced Pool Heat Pump Technology
Every iSPA unit combines premium components and intelligent controls to deliver reliable, efficient pool heating and cooling in any climate.
R32 Refrigerant System
- Low GWP of 67568% lower global warming potential than R410A (GWP 2088). More thermodynamically efficient per kilogram of charge.
- Danfoss Electronic Expansion ValvePrecision superheat control across all operating conditions. Faster response than mechanical TXVs for optimal efficiency.
- SANHUA 4-Way Reversing ValveSeamlessly switches between heating and cooling modes. Heat your pool in winter, cool it in summer.
DC Inverter Components
- Panasonic DC Inverter CompressorVariable-speed operation matches output to demand. No hard starts, reduced wear, lower noise, and peak efficiency at partial loads.
- Nidec DC Fan MotorBrushless DC motor with stepless speed control. Whisper-quiet operation with precise airflow management.
- Titanium Tube-in-Shell ExchangerMarine-grade titanium resists saltwater, chlorine, and bromine. No corrosion, no contamination, maximum heat transfer.
Touchscreen Controller
Intuitive colour touchscreen for temperature setting, scheduling, mode selection, and diagnostics. No complex menus.
Wi-Fi Ready
Connect to your home network for remote monitoring and control via smartphone app. Check pool temperature from anywhere.
Spray-Coated Steel Body
Durable white steel cabinet with anti-corrosion spray coating. Designed to withstand outdoor pool environments year-round.
Why Choose iSPA Over Gas or Electric?
Traditional pool heating methods are expensive, inefficient, and increasingly obsolete. The iSPA delivers superior results at a fraction of the running cost.
Gas / Electric Pool Heaters
- COP of 0.8-1.0 -- most energy wasted as exhaust
- High monthly gas or electricity bills
- Combustion produces CO and NOx emissions
- Gas supply infrastructure required
- Short lifespan of heating elements and burners
- No cooling capability
Karnot iSPA Heat Pumps
- COP up to 7.52 -- 5-7x more efficient
- Up to 85% lower running costs
- Zero on-site emissions or combustion
- Only requires a standard electrical connection
- Long-life titanium exchanger and DC compressor
- Both heating and cooling modes built in
COP up to 7.52
Over 7 kWh of pool heating for every 1 kWh of electricity. Under optimal conditions, COP can reach 14.05.
Heat and Cool
Heating mode: 18-35 °C water output. Cooling mode: 15-32 °C. Extend your swim season year-round.
Quiet Operation
Noise levels from just 37 dB(A) on smaller models. DC inverter runs at low speed when demand is light.
Wide Ambient Range
Operates from -15 °C to 45 °C ambient. Reliable performance in tropical, temperate, and cold climates.
Saltwater Compatible
Titanium tube-in-shell exchanger is immune to saltwater, chlorine, and bromine corrosion.
Low Environmental Impact
R32 refrigerant with GWP 675 -- 68% lower than R410A. Efficient operation further reduces carbon footprint.
Ideal Applications
The iSPA range covers every aquatic heating and cooling need, from backyard pools to large commercial facilities.
Residential Pools
Extend your swim season to year-round comfort. Quiet operation and compact design suit any backyard installation.
Commercial Pools
Gyms, sports centres, and swim schools. Reliable heating for high-usage pools with demanding temperature requirements.
Hotel and Resort Pools
Maintain perfect pool temperature for guests 365 days a year. Silent operation preserves the premium guest experience.
Water Parks
Large-capacity 3-phase models (28-39 kW) efficiently heat large pools and lazy rivers. Cascade multiple units for any size.
Spas and Hot Tubs
Precise temperature control from 18-35 °C. Maintain therapeutic water temperatures efficiently without electric elements.
Complete iSPA Product Range
11 models from 6.5 kW to 39 kW. Single-phase (220V) and three-phase (380V) options for residential and commercial installations.
Single Phase (220V)
Three Phase (380V)
All prices: Contact for Quotation | Multiple units can be cascaded for pools larger than 100 m³
Pool Heat Pump Calculator
Find the right iSPA model for your pool. Enter your pool details below and we will recommend the ideal unit.
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Price: Contact for Quotation
UK: £0.17/kWh electricity
Need an Accurate Quote?
This calculator provides estimates based on typical conditions. For a precise sizing analysis including local climate data, pool construction, and wind exposure, request a complimentary pool heating assessment.
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