This case study delves into the real-world running costs of an air source heat pump system installed in a typical two-bedroom home in South Wales. We examine a full year of energy consumption data from a Viessmann 5kW heat pump (with a potential brand discrepancy noted in the original source), providing a detailed breakdown of heating and hot water usage. The analysis incorporates the contribution of a 2kW solar panel system, illustrating the impact of renewable energy generation on overall energy expenditure. The study focuses on providing a realistic assessment of the financial benefits, considering both energy efficiency and the current cost of electricity.By meticulously analyzing data from the My Viessmann app, we determine the total energy consumption, the heat pump's impressive Seasonal Coefficient of Performance (SCOP), and the effective cost savings achieved through solar panel integration. This detailed breakdown offers a clear picture of the daily running costs, providing valuable insights for homeowners considering a similar investment. The concluding remarks emphasize the importance of considering individual factors influencing energy consumption while highlighting the long-term financial and environmental advantages of such a sustainable heating solution.
Pros And Cons
- Provides heating and hot water
- Achieved a SCOP of 4.9 (meaning for every 1 kilowatt of electricity used, 4.9 kilowatts of heat were generated)
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System Overview: A typical South Wales home
This case study analyzes the running costs of a heat pump system in an average two-bedroom property near Cardiff, South Wales. The system comprises a Viessmann 5kW air source heat pump (note: the original transcription may have contained a transcription error, and the video title mentions Vaillant, potentially correcting the error).
The hot water system includes a 180L hot water cylinder maintaining water at 50°C. The heating system uses a 40L volumizer supplying underfloor heating on the ground floor and radiators on the first floor, all on an open loop system.
The house boasts modern double glazing, cavity wall insulation, 300mm of loft insulation, and 2kW of solar panels (no battery storage). The system operates using pure weather compensation to maintain a 21°C living environment.
Energy Consumption Data: Analyzing the My Viessmann App
Data from the My Viessmann app reveals the yearly energy consumption for both heating and hot water. In 2024, heating consumed 1071 kW, and hot water used 249 kW, resulting in a total heat pump electricity usage of 1320 kW.
The system's impressive SCOP (Seasonal Coefficient of Performance) is 4.9, meaning for every 1 kW of electricity used, 4.9 kW of heat is produced. This efficiency is a key factor in determining overall running costs.
Total household electricity consumption for 2024, including the heat pump and other appliances, reached 2173 kW. The solar panels generated 1900 kW, offsetting a significant portion of electricity usage.
Cost Calculation and Conclusion: Is it worth it?
Based on an average electricity price of 24.5p per kWh (excluding the standing charge of 6.99p), the estimated daily running cost for the entire property, including heating, hot water, and other appliances, comes to approximately £145. This calculation incorporates the energy generated by the solar panels.
While the initial investment in a heat pump system and solar panels is significant, the long-term cost savings can be substantial, particularly when considering the increasing cost of energy. The efficiency of the heat pump, coupled with the solar panel contribution, makes this a worthwhile investment for many homeowners.
This analysis showcases the potential for reducing energy bills through efficient technologies and careful energy management. The positive impact on both the environment and household finances should be carefully considered when weighing the pros and cons of such a system. However, individual cost savings will vary based on factors like climate, energy usage, and electricity tariffs.