If you are the proud owner of a hot tub or swim spa or are looking to purchase a new hot tub or swim spa then adding an air source heat pump is the smart choice. Hot tub and Swim spa heat pumps are our best-selling accessories with hundreds of customers already benefiting from savings on their electricity costs.
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Due to how the system works, our air source heat pump will still produce heat even if the ambient air temperature is below zero as the compression of the refrigerant creates heat. Not only is this a far more cost-effective solution to heat your hot tub, it is also a much more eco-friendly option.
The chart below shows the kWh used by the heat pump to maintain the set point of 40°C. The test period is for 31 days between the 8th Dec 2022 and the 7th January 2023.
This was an ideal test period as the beginning of the test on the 8th Dec 2022 the UK experienced a very cold spell with temperatures dropping several degrees below zero.
Figure 1 shows the recorded temperature on the 10th of Dec 2022 of -3.1°C and the chart shows the kWh usage of 5.62kWh. Compared to figure 2 showing the temperature for the 4th of Jan 2023 being 11.5°C the kWh usage reduced to only 1.66 kWh.
The total kWh used by the heat pump over this period was 116.21 and this equates to an average of 3.75 kWh per day. As the ambient temperature rises, we can easily see that the efficiency of the heat pump increases significantly.
To equate these kWh figures to a cost, we use the current price per kilowatt hour as a multiplier. Currently at the time of updating this case study the new kWh rate as per Ofgem is: 27.35 pence per kWh (1/10/2023)
10th December 2022, a cold day where we experienced temperatures below zero – kW usage = 5.62kWh used / Heating cost = £1.53
For comparison on the 4th January 2023 we had much a warmer temperature and the kW usage was only 1.66 equating to a cost of £0.45p.
The total average daily Kilowatts used during this winter test period of 31 days equated to 3.75 kW meaning the average daily cost of the heat pump was only £1.03p.
Looking at further long-term results we continued to measure the heat pump consumption through the winter, spring, and summer months.
At the time of updating this case study we can report on a ten-month period of testing. This period covers the initial 31-day test period from 8th December 2022 up to the 7th September 2023.
The chart and table below show the total kilowatts consumed by the hot tub air source heat pump by month during this period.
IN SUMMARY
We can now look at a long period of results covering warm and cold months to determine an average overview of the consumption and cost experienced when using the Vian S7 air source heat pump to heat the hot tub.
The total kilowatts used by the air source heat pump over this period was: 749.55.
Resulting in an average monthly kW use and cost of 74.96 kW / £ 20.50.
Resulting in an average daily kW use and cost of 2.46 kW / £ 0.67p when we gross this data over a year and averaging by 365 days.
Quite incredibly these figures mean that the total cost of the air source heat pump consumption over the ten months test period equates to £205.00 at a rate of 27.35 pence per kilowatt hour.
These recordings and data are only for representative purposes as there are so many variables with different locations, temperatures and usage that could result in different figures.
Whilst not independently vetted, we have performed this test to measure the kWh power consumption of our Vian 7kw S7 plus heat pump to show some of the real-world results.
We used a simple inline kWh meter that connects to a smart home system to measure and record the usage.
We chose to undertake this testing during the colder months and incorporate a very cold period of weather to record the results in these conditions. As the ambient temperature increases through the seasons then the efficiency of the heat pumps will increase, and the kWh usage will reduce as can be seen with the longer-term testing results.
Our figures and recordings are only relating to the consumption of the air source heat pump. Whilst fitting an air source heat pump to your hot tub or Swim Spa will significantly reduce overall running costs it will only reduce costs pertaining to heating.
We believe it is clear to see that a Vian Power Heat Pump is an extremely efficient heating solution for your hot tub or Swim Spa.
