If you enjoy regular use of your hot tub, you’ve probably noticed how quickly the running costs can build up, particularly when it comes to heating. Most hot tubs use electric elements, which are simple to run but can consume a fair amount of electricity.

As energy prices continue to rise, many hot tub owners are starting to look at other ways to keep the water warm without driving up bills. One option gaining attention is the air source heat pump, which can heat your spa more efficiently while using less power.

KEY TAKEAWAYS

• An air source heat pump uses outside air to heat your hot tub.
• It can use up to 75% less electricity than a standard heater.
• Some hot tub owners save over £500 a year on energy bills.
• Simple habits like using a good cover can boost savings further.

How an air source heat pump works with a hot tub

An air source heat pump, often called an ASHP, is a unit that takes warmth from the air outside and uses it to heat your water. Even when temperatures are low, the system can still extract heat from the air and use it to maintain a steady temperature in your spa.

The reason people are turning to these units is because of how they use electricity. Electric heaters convert one unit of energy into one unit of heat. A heat pump, on the other hand, can produce three, four or even five units of heat for every unit of electricity used. This is measured by a number called the Coefficient of Performance, or COP.

How do they help reduce energy use?

One of the biggest reasons to use an ASHP with a hot tub is to use less electricity. These pumps heat water by moving existing warmth rather than generating it from scratch. That means they need less power to do the same job.

Here’s a quick look at how this works in practice:

• A standard 3 kW electric heater uses 3 kWh of electricity every hour
• A heat pump with a COP of 4 gives you the same amount of heat while only using 0.75 kWh
• That difference adds up to a saving of around 75% on your heating energy

When you multiply that across weeks and months of use, the long-term reduction in running costs can be quite noticeable.

What to expect on the energy bill

Switching to a heat pump can lead to noticeable savings on your monthly electricity costs. Many hot tub owners report spending much less on heating after making the change, especially when the tub is used regularly.

Although there is an upfront cost involved with buying and installing the unit, the reduction in ongoing energy use can help offset that over time. For people who use their hot tubs often, the long-term savings tend to make the switch worthwhile.

Maintenance and running tips for efficiency

If you’re using an ASHP with your hot tub, there are a few easy habits that can help it run more efficiently. These small steps can support performance and help you avoid wasting energy.

• Annual servicing. Have a qualified technician check the system once a year to keep everything running smoothly.
• Allow for good airflow. Install the pump in an open area with space around it, so it can draw in air easily without obstructions.
• Use an insulated cover. When your hot tub is not in use, keep it covered with a thick, well-fitted lid to trap heat and reduce heat loss.
• Lower the temperature between uses. Slightly reducing the water temperature when you’re not planning to use the tub can take pressure off the system and help lower energy use.

These tips don’t take much effort, but they can help make your heating setup more efficient in the long run.

Could a heat pump be a better fit for your hot tub?

If you’re looking for ways to reduce the cost of heating your hot tub, an air source heat pump is worth considering. It uses less electricity to produce the same amount of heat, which can help lower your running costs.For those who use their hot tubs regularly or plan to keep them running throughout the year, the savings can add up over time. It’s also a practical choice for anyone aiming to reduce energy use at home without giving up the relaxing benefits of spa ownership.