Mitsubishi Ecodan Heat Pump Installation in Cornwall

Mitsubishi now offers two parallel Ecodan ranges: the established PUZ-WM R32 series and the newer PUZ-WZ R290 series. Both are excellent products, but they suit different scenarios. R32 (GWP 675) is the established refrigerant with the largest installed base, lowest unit cost, and broadest installer familiarity. It achieves SCOP figures of 4.6 at 35°C and 3.4 at 55°C. R290 (propane, GWP 3) is the future-proof choice — it can deliver flow temperatures up to 75°C without significant efficiency loss, making it ideal for retrofitting onto older Cornish radiator systems originally sized for 70°C boiler flow temperatures.

For new-build customers in Cornwall (Mawnan Smith, Pillaton, Goldsithney, anywhere with underfloor heating designed for 35°C flow), we typically recommend the R32 PUZ-WM. For retrofit onto existing radiator systems — which is around 80% of our Cornish workload — we increasingly recommend the R290 PUZ-WZ for its higher-temperature capability and lower environmental footprint. Both qualify identically for the £7,500 BUS grant.

Mitsubishi has invested heavily in acoustic engineering. The Ecodan PUZ-WM 8.5kW operates at just 31 dB(A) at one metre in low-noise mode — quieter than a domestic refrigerator and 10dB below the Permitted Development limit at the neighbouring property boundary. This matters in Cornwall because many of our customers live in tightly-packed coastal villages (Mevagissey, Polperro, Mousehole) where outdoor space is limited and neighbour boundaries are close. We can typically install an Ecodan in courtyards or side returns where competitor units would breach planning noise limits.

The acoustic performance also enables installation under bedroom windows or beside conservatories without complaints. We carry out a full MCS 020 acoustic calculation as part of every quotation, providing documented evidence that the unit will operate within Permitted Development limits at the nearest neighbour habitable window. This protects both you and us from any post-installation planning issues.

Mitsubishi's Flow Temperature Controller (FTC6 in current models) is the brains of the Ecodan system, and arguably its biggest competitive advantage. The FTC controls weather compensation, room thermostat input, hot water priority, anti-legionella scheduling, and remote monitoring via the MELCloud app. Crucially, FTC enables PAS 2035-compliant low-temperature design — the controller continuously trims the flow temperature down to the lowest possible level that maintains comfort, maximising real-world COP.

For solar PV pairings (which we configure on around 65% of Cornish Ecodan installations), the FTC's smart-grid input accepts a signal from your solar inverter to boost cylinder temperature when surplus generation is available. Combined with a Zappi diverter or hybrid inverter, this can reduce annual grid electricity consumption by 30–40% versus a heat pump alone.

Mitsubishi's pre-plumbed Ecodan cylinders (170L, 210L, 300L) come factory-fitted with the FTC controller, expansion vessel, three-port valve and pressure relief — saving installation time and reducing on-site complexity. For most Cornish three- and four-bedroom homes, the 210L pre-plumbed cylinder is the default choice. For larger households or homes with high simultaneous hot-water demand (multiple bathrooms in use at once), we step up to the 300L unit.

For homes wanting smart top-down heating and tighter solar integration, we offer the third-party Mixergy 200L as an upgrade option (around £600 extra). Mixergy heats only the water you'll actually use, reducing standing losses and cylinder cycling — particularly valuable when paired with Cornwall's now-common solar PV systems.

CCS Heating & Renewables handles the entire Mitsubishi Ecodan installation process from initial enquiry through to BUS grant claim. After your survey and quotation, we submit your Boiler Upgrade Scheme application to Ofgem (typical voucher issue: 4–6 weeks), order your equipment from Mitsubishi's Pool-Cornwall-friendly Birmingham distribution centre (next-day delivery), and schedule your installation around your availability. Most installations take 3–4 days on site, with a final commissioning day that includes a full handover walkthrough using the MELCloud app.

You can read our full heat pump installation process and explore finance options spreading the net-of-grant cost over up to 10 years.

Typical fully installed pricing (May 2026, before BUS grant deduction):

• Ecodan PUZ-WM 5kW R32 + 170L cylinder — from £11,200
• Ecodan PUZ-WM 8.5kW R32 + 210L cylinder — from £13,400
• Ecodan PUZ-WM 11.2kW R32 + 250L cylinder — from £14,900
• Ecodan PUZ-WZ 8kW R290 + 210L cylinder — from £14,500
• Ecodan PUZ-WZ 12kW R290 + 300L cylinder — from £17,200

All prices benefit from 0% VAT and qualify for the £7,500 BUS grant which CCS deducts at point of sale. So an 8.5kW Ecodan installed costs from £5,900 net of grant — or £82/month over 72 months on our 0% APR finance plan.