The new SpaLine EVI air source heat pump from iNHEAT is the ultimate replacement solution for costly electric hot tub and swim spa heaters. This heat pump has a maximum coefficient of performance (COP) of 14.35
Suitable for hot tubs and swim spas. Includes FREE integrated WiFi app control.
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£1,799
Includes published sub-zero spa performance data (Air −10°C / Water 38°C) —
rarely shown by pool-derived heat pumps and a key reason SPA-LINE is suited to hot tubs.
| Air 26°C Water 26°C |
Heating power (kW) | 2.70 ~ 7.12 |
| Consumption (kW) | 0.19 ~ 1.15 | |
| COP (Coeff. of performance) | 14.21 ~ 6.19 | |
| Air 15°C Water 38°C |
Heating power (kW) | 1.85 ~ 5.67 |
| Consumption (kW) | 0.31 ~ 1.64 | |
| COP (Coeff. of performance) | 5.97 ~ 3.46 | |
| Key differentiator Air −10°C / Water 38°C figures are published — this is hot-tub-specific performance data (most competitors publish pool-temperature figures only). |
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| Air -10°C Water 38°C |
Heating power (kW) | 1.26 ~ 3.02 |
| Consumption (kW) | 0.39 ~ 1.45 | |
| COP (Coeff. of performance) | 3.23 ~ 2.08 | |
| Power supply | Single phase 220-240V ~ 50Hz | |
| Maximum power (kW) | 2.2 | |
| Maximum current (A) | 7.7 | |
| Operating ambient temperature range | -25°C ~ 43°C | |
| Unit dimensions (mm) | 626 × 464 × 476 | |
| Unit weight (kg) | 37 | |
| Sound pressure level at 10m (dBA) | < 32 | |
| Hydraulic connections (mm) | 1” male / ø32 – ø38 | |
| Heat exchanger | Titanium heating coil | |
| Rated water flow (m³/h) | 3.0 | |
| Compressor type | Rotary | |
| Refrigerant | R32 | |
| Protection rating | IPX4 | |
| Control panel | LCD display | |
| Operating modes | Heating / Cooling / Auto | |
The iNHEAT SpaLine EVI is a hot-tub-specific air source heat pump designed to maintain spa water at 38°C efficiently — even in colder UK weather.
With Full Inverter control and EVI (Enhanced Vapour Injection) technology, SpaLine automatically modulates output for stable temperature, lower running costs, and reliable year-round performance.

Automatically adjusts compressor speed in real time to maintain temperature efficiently and reduce wasted power.

Enhanced Vapour Injection supports stronger performance and efficiency at low ambient temperatures.

Control modes, settings and schedules remotely via the Smartlife app — at home or away.

Simple local control with an LCD display, plus app-based control for convenience.

Designed for real spa temperatures — with published figures at Air 15°C/38°C and Air -10°C/38°C.

Automatic, Silent/Eco, Boost, plus Heating/Cooling/Auto options for flexible spa comfort.

Low published sound pressure for outdoor spaces — < 32 dB(A) at 10m (spec).

Compact footprint (approx. 626 × 464 × 476 mm) and simple connection via bypass kit (optional).
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