A Victorian terrace in East London has achieved zero-emission heating through the installation of an R290 (propane) air-source heat pump, demonstrating that even period properties with solid walls and heritage constraints can successfully transition away from fossil fuels. The system achieved a seasonal efficiency (SCOP) of 4.35—more than four times more efficient than the previous gas setup—while delivering consistent comfort throughout the home, including a challenging double-height kitchen space. This case study provides a replicable model for decarbonizing the UK's aging housing stock, where approximately 1% of households currently use heat pumps

In 2024, Fairways & Spa Boracay — a 78-room mid-scale resort on Station 2, White Beach — replaced a 10-year-old fixed-speed R410A pool heat pump with an AquaCal Tropical T55, a vertical-discharge R32 DC inverter unit. Eighteen months of operation later: ~60% less electricity to hold a 28 °C pool setpoint, ~40% smaller equipment footprint, blended COP ~9.5 under tropical ambient, and a 14-month payback on the unit price, electricity savings only.

In the wellness hospitality sector, hot water is not a utility—it is part of the therapeutic promise. When guests pay premium rates for a restorative experience, a cold shower is more than an inconvenience; it is a breach of trust.

This case study examines how a 20-villa wellness resort in Koh Samui, Thailand, solved a chronic hot water reliability problem that was generating 12–15 guest complaints per month and pulling down satisfaction scores. Over a 12-month period following the upgrade, the resort recorded zero hot water-related complaints, zero downtime events, and a guest satisfaction improvement from 3.2/5 to 4.8/5 on the specific metric of water temperature.

The solution combined dual 45 kW heat pumps with automated failover (15-second transition), a 1,500-litre buffer tank, IoT-based monitoring on every villa feed, and a 60 kVA backup generator. Total investment was ฿1,525,000. Annual savings amount to ฿259,800 from energy reduction (18%), maintenance reduction (74%), eliminated guest compensation, and recovered staff time. Payback is 5.9 years.

The resort now markets "guaranteed instant hot water" as a competitive differentiator—a claim backed by 12 months of continuous operational data.

In late 2023, a 180m² home built in 1978 in Aix-en-Provence swapped its oil boiler for an R290 propane heat pump paired with a home energy management system. Twenty-four months of continuous monitoring show the energy bill dropped from €4,850 to €1,940 per year—a 60% cut. CO₂ emissions fell from 7.4 to 3.2 tonnes annually. The system holds indoor temperature within ±0.9°C, compared to ±3.5°C before.

The owner put in €28,500. French MaPrimeRénov' subsidies covered €5,200, bringing net outlay to €23,300. Payback sits at 6.2 years on that net figure. Over 15 years, net lifecycle savings project to €29,650.

The project matters beyond one house. It demonstrates that R290—a natural refrigerant with a global warming potential of 3—can work with existing radiators, not just underfloor heating. It shows that intelligent control adds about €560 per year in extra savings. And it offers a replicable template for the millions of European homes still burning oil or gas.

"A real-world retrofit in Dortmund replaced gas boilers in two apartment blocks with a six-unit R290 heat pump cascade, cutting 20.5 tonnes of CO₂ a year. The project traces a straight line to Fraunhofer ISE's LC R290 research, which has pushed propane charges down to 150 g for apartment-level units."

TONGYI addressed these challenges with its DC Inverter Commercial Swimming Pool Heat Pump series. The system uses a variable-speed compressor that eliminates the disruptive start-stop cycling of fixed-speed units, reducing operational noise to approximately 46–57 dB(A)—comparable to a quiet conversation. This near-silent operation preserves the natural ocean soundscape that defines the overwater villa experience.

Danang Beach Hotel replaced its failing electric water heaters with TONGYI commercial heat pumps, cutting energy costs by 65% and hot water complaints by 95%. Installation took 14 days with no guest disruption. The system paid for itself in 19 months and is projected to last 12-15 years. Manufactured in China and installed by local Vietnamese teams, this project demonstrates seamless technology transfer across the APEC region. For Southeast Asian hotel operators, it proves that reliable, cost-effective hot water infrastructure is achievable without expensive gas lines or oversized electric systems—delivering better guest satisfaction, lower costs, and a smaller environmental footprint.


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CapitaSpring — a 280-metre, 51-storey integrated development designed by Bjarke Ingels Group in Singapore's financial district — houses Citadines Raffles Place Singapore, a 299-unit premium serviced residence managed by The Ascott Limited. To meet round-the-clock domestic hot water demand while aligning with CapitaLand's ESG commitments and Singapore's stringent Green Mark standards, the property deployed four Tongyi TRW50 inverter heat pumps as its central hot water solution, replacing less efficient electric heating infrastructure.

This case introduces CapitaLand Singapore headquarters hot water project, which adopted 3 sets of TRT60 commercial air source heat pumps to build a centralized constant-temperature hot water system for the Grade A office building. Installed in indoor equipment room with complete insulated circulating pipelines, the system features high energy efficiency, zero combustion safety risks, stable operation under Singapore' s tropical climate and low maintenance cost. It cuts energy consumption greatly, helps the client achieve green low-carbon goals, and becomes a benchmark heat pump application project in Southeast Asia commercial real estate.

Eight Tongyi TPR100 anti-corrosion pool heat pumps are installed at Bali Padma Hotel for infinity pool heating. Modular parallel design, full inverter and salt-mist resistant structure realize precise constant temperature, sharply reduce power consumption and match the resort’s green low-carbon operation targets.

CapitaLand deployed three Tongyi TRT60 modular heat pumps for its commercial hot water upgrade in Singapore. Featuring high energy efficiency, intelligent load adjustment and stable tropical performance, the system ensures reliable year-round hot water supply, cuts energy costs and supports green building and corporate decarbonization goals.

Three Tongyi TRT40 modular heat pumps are installed at The Stones Hotel in Bali, Indonesia, for central hot water system upgrade. Adapting well to tropical high-load conditions, the intelligent parallel system ensures stable round-the-clock hot water supply, reduces energy costs and supports the resort’s green low-carbon operation.