Thermotec Aero 21
Higher-output pool heat pump for larger residential pools.
- Full-inverter compressor
- Titanium heat exchanger
- Reinforced ABS casing
- Wi-Fi control
- 3-year warranty
The same inverter technology that has heated hundreds of UK pools, now engineered for home heating.
Why the Thermotec Aero 21?
Designed for larger residential pools that need extended swim seasons. Inverter compressor and reinforced casing for long outdoor service.
Specifications
All performance data at rated conditions. COP measured at A7/W35 (7 °C ambient, 35 °C flow), representative of UK shoulder season.
Performance
- Heating output (A27/W26)
- 21.0 kW
- COP (A27/W26)
- 12.5
Acoustic
- Sound at 1 m
- 49 dB(A)
Electrical
- Power supply
- 230 V / 1 ph
Refrigerant
- Refrigerant
- R32
Installation guide
Technical installation requirements for MCS-certified heating engineers. Full installation manual available in the documentation section below.
System requirements
- Closed wet heating system (hydronic)
- Minimum flow rate: consult datasheet
- Buffer tank recommended for systems < 20 litres water volume
- Expansion vessel and safety valve required on flow circuit
- Suitable for underfloor heating and low-temperature radiators
Electrical supply
- 230 V / single phase
- Dedicated MCB recommended, check datasheet for current draw
- Earth bonding required per BS 7671
- Smart meter / time-of-use tariff compatible
- Wired controller or Wi-Fi app control included
Siting & clearances
- Outdoor unit on wall bracket or ground slab
- Minimum 300 mm clearance front, 150 mm sides
- Keep clear of openable windows/doors, see planning notes
- Permitted Development: ≤ 42 dB(A) at 1 m from neighbour
- Not suitable for installation in a fully enclosed space
Hot water cylinder
- Requires an indirect unvented cylinder if replacing a combi boiler
- Recommended cylinder size: 180–250 litres (depending on occupancy)
- Immersion heater backup recommended
- Cylinder stat set to 50–55 °C for normal operation
- Legionella prevention cycle: 60 °C, once per week
Refrigerant
- R32, GWP 675 (low compared to R410A at 2,088)
- Factory charged, field refrigerant work requires F-Gas certification
- Refrigerant circuit sealed; do not open without certification
- Outdoor unit contains flammable refrigerant, follow handling guidance
- Leak detection sensor recommended in enclosed plant rooms
MCS & compliance
- MCS product-listed, qualifies for Boiler Upgrade Scheme grant
- Installation must be completed by an MCS-accredited contractor
- MCS certificate issued post-installation for grant redemption
- Commissioning log required, forms supplied with unit
- Building regulations notification may be required (Part L)
Documentation
Full documentation ships at product launch. Trade enquiries can request pre-release datasheets now.
Full commissioning guide for MCS-certified installers. Includes pipe sizing, electrical requirements, and commissioning checklist.
Everyday operation, thermostat settings, Wi-Fi setup, and maintenance schedule for homeowners.
Full performance curves, COP data at multiple ambient conditions, dimensional drawings, and wiring diagrams.
MCS product listing confirmation. Required by your installer to redeem the £7,500 Boiler Upgrade Scheme grant.
Not sure if this is the right size for your home?
Read our UK sizing guide or talk to our team, we can help match output to your heat loss.
