Hot tub in the garden but bills through the roof. Start soaking in free sunshine.

We know up to 93% savings on your hot tub heating bill is a big claim. Here is what makes it possible.

Four components arrive pre-assembled, labelled and ready to connect in under 20 minutes. Once connected, they work as one system. The EcoBrain manages all of it automatically, so you never have to decide when to use solar, battery or mains. The app lets you check in, set a target temperature or schedule a soak whenever you want.

The solar panel sits in your garden and harvests energy all year round, not just on sunny days. It feeds the system directly and keeps the battery topped up. No roof work, no planning permission.

The smart power box is the heart of the kit. It holds the batteries, the inverter and the EcoBrain controller in one weatherproof unit. Energy in from the panel, energy out to the heat pump, all managed automatically and monitored in real time from your phone.

The smart switch box connects your mains supply as a quiet backup. When the battery is low and the heat pump still needs to run, it draws from the grid. When free energy is available again, it switches back. You will never notice the handover but you can track all energy use in the app.

The heat pump is why the numbers work so well. It heats your water several times more efficiently than the standard resistance heater your tub came with, which means even on the days you do fall back to mains, you are using a fraction of the electricity your current setup would.

The original pump it's heating days are over. The heat pump heats your water twice as fast and uses a fraction of the electricity, so you will only ever want your original pump for bubbles.

Every component arrives pre-assembled and labelled.

The smart power box arrives wired and ready to go. Two cables connect it to the rest of the system: one from the solar panel, one to the smart switch box. Inside sits the solar control, battery storage and the EcoBrain that ties the whole system together, all in one lockable, weatherproof enclosure

1. The inverter and solar controller
This is what turns sunshine into usable power. A pure sine wave inverter and solar controller convert the energy coming in from the panel into clean, stable electricity for the heat pump. It runs only when the heat pump needs it, wasting nothing. Live solar input figures stream to the EcoBrain and app continuously, so you can see how much free energy you are generating by the minute, hour or day.

2. The batteries
Two LiFePO4 batteries bank up to 2.56kWh of stored energy. In practice that is enough to run the heat pump for over two hours and lift your water temperature by around 4 degrees. Built-in heating pads on the battery casing switch on automatically in freezing weather, protecting performance through winter without you having to do anything.

3. The EcoBrain
The EcoBrain is the onboard computer that keeps the whole system running at its best. It reads the battery level, checks hourly weather forecasts and picks the smartest moment to heat your tub. It also looks after the box itself, running cooling fans if the temperature inside rises and warming the batteries when it drops. Everything it knows is available on your phone, in real time.

The heat pump draws water from your tub, warms it efficiently and returns it, all through a pre-assembled, insulated water circuit that connects in minutes. It heats twice as fast as your tub's original pump and uses a fraction of the electricity, whether it is running on solar or mains.

The heat pump
This is where a lot of the efficiency savings come from. It delivers several times more heat per unit of electricity than the resistance heater your tub came with, which is the core reason the system cuts costs so dramatically. It ramps up gradually to protect the batteries, targets a comfortable 40°C and operates down to minus 15°C. A titanium heat exchanger resists corrosion, the unit is weather-rated to IPX4, runs on R32 refrigerant and is quiet enough that it will not trouble neighbours. The EcoBrain controls exactly when it switches on.

The circulation pump
A low-draw pump moves water between the tub and heat pump using less power than a light bulb, quietly and consistently.

Connecting your tub
No need to drain. The kit includes plugs that let you disconnect the original pump while the tub stays full. Brand-matched fittings are supplied for your specific tub model. The pre-assembled insulated hose kit connects at both ends in under five minutes, with built-in check valves that protect the pump so it never runs dry. A short hose and clips reconnect your original pump for bubbles when you want them.

Your existing pump
Stays exactly where it is, just for air jets.

The switch box manages the flow between free solar and battery power and your household mains, automatically and safely. Two waterproof plugs connect the whole system: green to the smart power box, orange to your mains supply.

Once plugged in, the system decides. It monitors battery charge, heat pump demand and your heating schedule, then switches cleanly between energy sources without you touching anything. Or switch the heat pump on manually from the app and the system will handle which energy source to draw from.

Inside, a protected smart relay controls exactly when the heat pump and circulation pump switch on, and measures precise wattage in real time. Combined with the live solar input from the EcoBrain, the app shows you exactly what energy is coming in and going out at any moment.

The panel sits in your garden on an adjustable ground-mounted frame. No roof, no planning permission, no installation team. It keeps harvesting useful energy even on overcast days, and because it captures light from both sides, it works harder than a standard panel from the moment it is installed.

It is a 610W N-type TOPCon bifacial panel, which at 23.81% efficiency puts it among the most capable panels available at this size. It comes backed by a 30-year power warranty.

The bifacial design is why it performs particularly well in a UK garden setting. Mirrored stainless steel reflectors on the mounting base bounce ambient light onto the rear face of the panel, squeezing more energy from low winter sun, early mornings and late evenings when every watt counts. Adjustable angle brackets let you fine-tune the tilt for your garden and the season.