10/04/2026
Mr & Mrs J Langport
Project Overview The homeowners wanted:
• A renewable heating system with significantly lower running costs
• Removal of the oil tank and boiler
• A compact, cylinder free hot water solution
• Improved comfort and reliability
• A system compatible with future solar PV installation
The chosen solution was a Midea Thermal Arctic R290 10 kW air source heat pump combined with a Sunamp Thermino 210 x Plus heat battery, complete with all necessary controls, valves, and zoning upgrades.
Why This System Was Chosen
Midea Thermal Arctic R290 10 kW ASHP
• High efficiency even in cold weather
• R290 refrigerant for superior performance and low GWP
• Quiet operation suitable for residential areas
• Ideal for retrofit radiator systems due to strong output at moderate temperatures
Sunamp Thermino 210 x Plus Heat Battery
• Replaces the need for a hot water cylinder
• Compact footprint—ideal for homes with limited airing cupboard space
• Delivers mains pressure hot water
• Fast recharge from the heat pump
Controls & Valves
• 3 port diverter valve for DHW/space heating switching
• Automatic bypass valve
• Weather compensated heat pump controller
• Smart thermostats for improved zoning
• Full safety set: PRVs, expansion vessels, isolation valves
Assessment & Design
Heat Loss Survey
A full room by room heat loss calculation was carried out. Peak heat demand: 7.2 kW This confirmed the 10 kW Midea Arctic would operate efficiently, with temperatures as low as minus 6
1. Removal of Existing System
• Oil boiler and flue removed
• Oil tank decommissioned and disposed of
• Pipework flushed and cleaned
2. Heat Pump Installation
• Midea Arctic positioned on anti vibration pads
• Insulated pipework run to plant area
• Weather sensor installed for compensation control
3. Sunamp Heat Battery Installation
• Compact unit installed in former airing cupboard
• Connected to DHW circuit with mixing valve
• Safety valves and expansion vessel fitted
4. Controls & Commissioning
• 3 port valve installed for DHW priority
• System filled, pressure tested, and balanced
• Heat pump commissioned with weather compensation curve
• Homeowner app and smart controls configured
Performance Results
Heating
• Flow temperature on weather compensation: 35- 50°C
• Average COP: 3.9–4.6 (excellent for a retrofit radiator system)
• Stable, even heat throughout the home
Hot Water
• Full recharge time: ~50 minutes
• Delivers 210 L equivalent of 50–55°C hot water
• No cylinder required, freeing up storage space
Key Benefits of This Retrofit
• Major running cost reduction compared to oil
• Compact hot water solution with no cylinder
• High efficiency thanks to R290 refrigerant
• Improved comfort with stable, low temperature heating
• Quiet, reliable, low maintenance system
Conclusion
This retrofit demonstrates how a traditional oil heated home can be transformed into a modern, low carbon property using a Midea Thermal Arctic R290 10 kW heat pump and Sunamp Thermino 210 x Plus heat battery. The system delivers excellent comfort, reduced running costs, and a compact, future ready hot water solution—proving that heat pumps are not only viable but highly effective in retrofit scenarios.
