Lay-Z-Spa AirJet SPA Heater With Wifi-GB(Gray). This WiFienabled pump is the next step in hot tub technology enabling you to control your AirJet Plus pump, heating and massage system at the click of a button on your smart device. This Lay-Z-Spa Pump is a direct replacement for the heater pump supplied with Lay-Z-Spa Milan, Havana, Singapore and Barbados 2021 models but can also be an upgrade for any pre2021 Airjet hot tub liner. It is essential for heating the water, filtering the water and operating the massage system. If your existing pump is damaged, this replacement is a vital piece of equipment. Without a working pump, you'll be unable to use your Lay-Z-Spa. The pump also has a timer function to heat up the water at a designated time. It's a great way to ensure the water is at the perfect temperature before you climb in. This pump is equipped with the new Freeze Shield technology, which allows you to set the pump to run at a low temperature, in a power-saving mode for long periods of time using minimal energy, whilst ensuring that the water does not freeze (the pump must be powered at all times).