What products does HK Dongda Supply Chain Limited supply?

We supply water cooled ice bath chillers from 0.3HP to 1.5HP, all-in-one cold plunge units in stainless steel and acrylic, far infrared sauna blankets, portable sauna tents and steam bath boxes, and infrared heating mats including red light and PEMF models.

Do you offer OEM, ODM and private-label services?

Yes. Our design team supports logo application, pattern and colour design, retail packaging and structural customization, such as our 0.5HP customized chiller with 1000 L/H flow and a 4-point outlet design.

Which certifications are available for your products?

We hold certifications and audits from SGS, CTTC, BSCI, ISO, OEKO-TEX and GRS. Applicable models such as the FUL-B stainless steel cold bath tub carry CE, FCC and RoHS certification. Documents can be requested per SKU.

Are your water chillers compatible with US and European power supplies?

Our 1.5HP ice bath water chiller is available in 110V and 220-240V versions to match North American, European and Asian power grids. Please confirm voltage and plug standard when ordering.

What refrigerants do your chillers use?

Our chillers use eco-friendly R290 or R32 refrigerant, aligned with European and US environmental policies for low global-warming-potential cooling.

How do I choose the right chiller horsepower for a cold plunge tub?

Chiller sizing depends on tub water volume, ambient installation temperature, target water temperature, usage frequency, local voltage and tub insulation. Home tubs are usually served by 0.3HP to 0.5HP units, while multi-user commercial recovery centres typically need 1.5HP. Share these data points and our engineers will recommend a matched model.

How can I get a catalog or product samples?

Use our Request a Catalog page or contact our export team by email or WhatsApp. We aim to reply to every B2B enquiry within 24 hours.

OEM Air Cooled Chiller Unit Supplier & Factory

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High-precision commercial ice bath chillers and thermal therapy units engineered to deliver scalable cooling power from 0.3HP to multi-ton setups.

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Global Enterprise Procurement Requirements

Strategic supply chain analysis for institutional buyers, athletic performance networks, wellness centers, and specialized industrial sectors.

Thermal Efficiency & COP Metric Standards

Modern enterprise procurement teams emphasize strict Coefficient of Performance (COP) benchmarks. Our air-cooled chiller systems maximize heat dissipation through micro-channel condenser coils, achieving optimal thermal transfer rates even under high ambient temperature conditions (up to 45°C).

Dual Refrigeration Cycle Safety (R290 / R32)

Compliant with modern environmental directives such as the EU F-gas Regulation and US EPA AIM Act. Our engineering lines leverage ultra-low Global Warming Potential (GWP) alternatives including propane (R290) and difluoromethane (R32) for carbon-neutral certification paths.

Turnkey OEM/ODM Scalability

From initial rapid CAD prototyping to full-lot CE, FCC, and RoHS validation, our Guangzhou manufacturing infrastructure supports multi-tier production schedules with custom exterior powder coatings, PCB layouts, customized fittings, and white-label mobile app integration.

600,000+

Monthly Capacity Units

2°C - 45°C

Precision Temp Range

200+

Skilled Tech Operators

100%

Quality Leak Testing

Industrial & Wellness Solutions Architecture

Integrating water filtration, chemical sterilization, smart sensor loops, and high-flow pumping into robust, self-contained air-cooled chiller units.

Advanced UV-C & Ozone Sanitation Loops

Eliminating pathogenic contamination in active water plunge circuits. Our UV modules deploy specific 254nm wavelengths complemented by corona-discharge ozone injection to oxidize contaminants without requiring heavy chlorine saturation.

Titanium Coaxial Heat Exchangers

Providing total immunity against salt corrosion and acidic chemical environments. Our titanium tube-in-shell evaporators guarantee extended service lifespans across residential, commercial athletic recovery tubs, and marine installations.

Microprocessor PID Temperature Stability

Automated variable frequency flow balancing and intelligent cycling prevent system freezing. The electronic expansion valve (EEV) regulates refrigerant mass flow precisely down to ±0.5°C variance from user setpoint.

Chiller Specification	0.3 HP High-End Series	0.5 HP Custom OEM Unit	1.0 HP Commercial System	1.5 HP High-Volume Chiller
Primary Application	Residential Cold Plunge / Solo	Boutique Spa & Recovery Club	CrossFit & Athletic Facilities	Continuous Commercial Operations
Cooling Capacity	850 Watts (2,900 BTU/h)	1,450 Watts (4,950 BTU/h)	2,800 Watts (9,550 BTU/h)	4,200 Watts (14,330 BTU/h)
Refrigerant Class	R290 Pure Hydrocarbon	R290 Eco System	R32 Low-GWP	R32 Enhanced Efficiency
Sanitization Suite	Micron Filter + UV-C System	UV-C + Ozone Generator	Dual UV-C + High-Output Ozone	Self-Regulating Clean System
Electrical Standard	110V 60Hz / 220V 50Hz	110V 60Hz / 220V 50Hz	Universal Multi-Voltage	110V-240V Automatic Switching

Technical Roadmap & Future Outlook

Strategic product iterations driving the convergence of smart IoT fleet management, thermal contrast recovery, and low-carbon design.

IoT Central Fleet Diagnostics (2025-2026)

Rolling out embedded LTE-M and Wi-Fi telematics across all high-capacity chillers. Facility owners and commercial operators can monitor real-time water conditions, flow parameters, filter clog thresholds, and run power optimization cycles remotely through custom branded iOS and Android applications.

Reversible Hybrid Thermal Contrast (Hot & Cold)

Eliminating separate immersion heating equipment. Our four-way reversing valve designs enable continuous, dual-mode operation, taking plunging tanks from near freezing (2°C) up to soothing therapy heat (42°C) within minutes, maximizing venue real estate efficiency.

Microchannel Ultra-Silent Condenser Coils

Aerodynamic fan blade engineering combined with specialized acoustic compressor blankets to drop operation decibel ratings below 48 dBA. Engineered for high-end boutique environments and urban residences where whisper-quiet operation is essential.

International Compliance & Factory Verification

Rigorous multi-stage qualification frameworks guaranteeing export readiness across North American, European, and Asia-Pacific markets.

Safety Directives & Approvals

Every product SKU undergoes testing to guarantee compliance with CE Low Voltage Directive (LVD), Electromagnetic Compatibility (EMC), FCC Part 15 Class B, and RoHS chemical hazardous limits, verified via third-party laboratories.

End-of-Line Helium Leak Testing

Refrigerant loops are pressurized and analyzed using precision mass spectrometer helium sniffers. This zero-leak guarantee protects internal compressor stability and ensures years of continuous cycle reliability.

Full Thermal Pull-Down Benchmarking

Every chiller batch is tested under loaded water tanks to monitor pulling-down speed from 25°C to 3°C, verifying pump hydraulic flow parameters, compressor amperage draw, and noise thresholds before crating.

Frequently Asked Technical & Sourcing Questions

Authoritative operational, maintenance, and sourcing guidance for wholesale equipment importers and brand owners.

How do air-cooled chillers manage heat rejection in tight interior recovery spaces? +

Air-cooled chillers extract heat from water through an evaporator and dump it directly into ambient air via condenser coils driven by high-efficiency fans. In tight spaces, maintain at least 40cm to 60cm of unobstructed clearance around air inlets and discharge louvers to prevent hot-air recirculation, which can lower COP efficiency and trigger thermal protection switches.

Why is R290 chosen over conventional fluorinated refrigerants for cold plunge equipment? +

R290 (propane) is a natural hydrocarbon refrigerant with an ultra-low Global Warming Potential (GWP < 3) and zero Ozone Depletion Potential (ODP). Beyond its strong environmental profile, R290 features excellent thermodynamic properties, including high latent heat of vaporization, enabling faster pulldown cycles with smaller refrigerant charges.

What is the standard preventive maintenance protocol for industrial cold immersion units? +

Routine maintenance includes: 1) Monthly inspection and cleaning of the air condenser filter to prevent dust buildup; 2) Replacement of 20-micron sediment filter cartridges every 4 to 6 weeks based on usage intensity; 3) Inspection of the quartz sleeve in the UV-C sterilizer every 6 months; and 4) Complete system water flush every 60 to 90 days.

Can the chiller unit be placed outdoors in freezing winter environments? +

Yes, our units feature an IPX4 waterproof exterior and automated freeze-prevention programming. When ambient temperatures drop near 0°C, the water circulation pump engages automatically to prevent ice crystal formation inside internal piping and titanium heat exchangers. If storing unused in sub-zero weather, the unit must be completely drained via its bottom port.

What minimum order quantities (MOQ) and customization levels apply to OEM/ODM private labeling? +

Standard OEM production (custom casing paint, laser-etched badges, branded touchscreens, user manuals, and customized cardboard packaging) begins at an MOQ of 50 units. ODM builds involving bespoke external chassis designs, custom pipe fittings, or specialized electronics have a baseline MOQ of 100 units, supported by our Guangzhou factory engineering team.