iNHEAT 7kW SpaLine EVI Heat Pump for Hot Tubs and Swim Spas

It can work with many electrically heated hot tubs and swim spas, provided the circulation flow, control system and pipe layout are suitable. The published optimum flow is 2m³/h and the hydraulic connection is 1-inch male with Ø32–38mm pipe compatibility; a bypass kit is sold separately. Wood-fired hot tubs use a different heating arrangement. Call us on 0330 043 0870 before ordering if you would like us to help check your setup.

The Full Inverter system is designed to use less electricity than relying solely on a resistance heater by matching compressor output to the heat the water needs. There is no honest one-size-fits-all percentage: the saving depends on spa volume, insulation, cover use, weather, set temperature, circulation time and your electricity tariff.

Professional installation is recommended. The unit connects to a suitable spa circulation circuit, normally through a bypass kit sold separately, and the water flow must be checked. Heracles does not currently install standalone heat pumps, so customers normally use a local hot-tub engineer or plumber and a qualified electrician. The two-year warranty is standard rather than conditional on professional installation, but the work must still follow the supplied instructions and applicable regulations.

Yes. EVI technology supports operation down to -25°C ambient temperature, making SpaLine suitable for year-round use when it is correctly sized and installed. As with every air source heat pump, available output and efficiency change with the outdoor temperature, so the spa cover, insulation and installation still matter.

The published supply is 220–240V single phase at 50Hz. A qualified electrician should confirm the cable, local isolation, breaker and RCD protection required for your installation against the supplied manual. Do not assume an existing spa socket is suitable without that check.

Yes. SpaLine is reversible and has a published water-temperature range of 10–40°C. You can select heating, cooling or automatic operation from the local controller, with remote control available through the Smartlife app.

Published sound pressure is below 32dB(A) at 10 metres. Perceived noise will vary with distance, operating mode, mounting and nearby walls, so position the unit on a stable base with the clearances in the installation manual rather than boxing it into a tight corner.

The iNHEAT SpaLine includes a two-year warranty from the original invoice date, with no reduced term for self-installation. Installation, use and maintenance must follow the supplied instructions. Contact Heracles Wellness before arranging any inspection, repair, replacement or return so we can review and authorise the claim.

Free mainland UK delivery is normally 3–5 working days. We will confirm the delivery window and email tracking once the unit is dispatched.

Yes. Integrated WiFi connects to the Smartlife app, allowing you to check the water temperature, change the set temperature and manage operating functions remotely. The app requires a 2.4GHz WiFi network and a usable signal at the heat pump; an outdoor access point or WiFi extender may be needed if the signal is weak.

Install it on a stable, level base, ideally concrete. Leave at least 300mm clear at the sides and rear and 1.5m clear in front, with nothing obstructing the top or airflow. Position the exhaust away from windows and noise-sensitive areas, and keep enough access for servicing.

Yes. For efficient operation, the hot tub, circulation pipework and cover should all be insulated. Poor insulation increases heat loss, slows recovery and can substantially reduce the saving compared with the spa's original electric heater.

Under normal conditions, the manual says a correctly sized heat pump can raise the water temperature by around 1–2°C per hour. Actual heat-up time depends on the starting temperature, water volume, outdoor temperature, insulation, cover use and flow rate. A small temperature difference at the outlet while running is normal.

Check the water flow monthly and clean the filter when needed. Clean the cabinet with a damp cloth and the rear evaporator carefully with a vacuum and soft-brush attachment. A qualified person should check the safety systems, wiring and earthing at least annually. If you drain and winterise the spa, disconnect the heat pump, drain it fully and store it in a dry place rather than leaving water inside to freeze.

Keep the water pH between 6.8 and 7.8. Any chlorine, bromine, pH or salt-chlorination dosing equipment should be installed downstream of the heat pump in the water circuit. Poor water chemistry can damage the heat exchanger and may affect warranty cover.