Gas-Fired Hot Water Boiler Project for a Civic Sports and Recreation Center in Vietnam

Project Overview

This municipal sports and recreation center is a large-scale, comprehensive public sports facility serving local residents, covering diverse heat-use scenarios such as a temperature-controlled swimming pool, public showers, and venue heating. Due to significant fluctuations in visitor traffic between day and night, the hot water system must meet stringent standards for stable, round-the-clock water supply, energy conservation, reduced consumption, and low-nitrogen environmental protection. After a comprehensive evaluation of multiple international heating equipment suppliers, the venue management ultimately selected the WNS series condensing gas-fired hot water boiler solution provided by Huano Boilers, installing two units at once to establish a highly efficient, stable, and clean heating system.

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Solution

Taking into account the large load fluctuations and diverse hot water demands typical of public venues, Huano Boilers configured two WNS2.1-85/65-Q horizontal low-nitrogen condensing gas-fired hot water boilers for this project:

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High-efficiency condensation with thermal efficiency exceeding 98%

The boilers feature a horizontal wet-back three-pass design, combined with a high-efficiency condensing heat exchanger at the rear, which fully recovers waste heat from flue gases. This achieves a comprehensive thermal efficiency of over 98%, significantly reducing gas consumption and operating costs.

Intelligent Load Adaptive Control

The system automatically adjusts the operating load of the units based on real-time parameters such as visitor traffic and outdoor temperature. It operates at full capacity during peak hours and maintains heat at low power during off-peak hours, completely eliminating the energy waste associated with traditional boilers that “use a sledgehammer to crack a nut.”

Ultra-Low-NOx Clean Combustion

Equipped with a fully automatic low-NOx burner, NOx emissions far exceed the limits set by Vietnam’s current environmental regulations, ensuring immediate compliance with environmental inspections and meeting the green and low-carbon requirements for urban public buildings.

Quiet and Safe, Suitable for Public Environments

The equipment operates with low noise and minimal vibration, and features multiple safety interlock protections, fully meeting the quiet and safe operation requirements of high-traffic venues such as sports stadiums and fitness centers.

Core Project Advantages

Stable, round-the-clock hot water supply has been achieved; there have been no further interruptions or temperature fluctuations in the constant-temperature swimming pool, public showers, or heating systems.

Monthly gas costs have dropped significantly, delivering tangible energy-saving benefits while simultaneously reducing operational and maintenance costs.

Boiler emissions consistently meet regulatory standards, helping the venue obtain green building certifications and build a positive public reputation.

Intelligent operation has reduced the workload on maintenance staff, with a user-friendly interface and convenient management.

Client Testimonial

“Since installing Huano hot water boilers, the venue’s hot water supply has been consistently stable throughout. There have been no interruptions or temperature fluctuations in the constant-temperature swimming pool, showers, or heating systems, completely resolving the previous issues of high energy consumption and inflexible control in our heating equipment. Monthly operating expenses have dropped significantly, and the energy-saving benefits are tangible.”

Nguyen Van Tuan.

Operations Manager

“Huanuo’s SZS series steam boiler has performed very stably on our continuous paper production line. The steam pressure fluctuation is minimal, fully meeting the high-quality steam requirements of the drying cylinders. After more than a year of operation, it has maintained high thermal efficiency and a low failure rate—one of the most reliable pieces of equipment on our line.”

Budi Santoso.

Equipment Manager, a major paper group in Indonesia

“Pharmaceutical processes have extremely high requirements for steam cleanliness and temperature control. Huanuo’s electric steam boiler produces clean steam with no on-site emissions and provides precise temperature control. It helped us smoothly pass several international quality system audits. It is a boiler that truly understands the needs of the pharmaceutical industry.”

María González.

Production Director, a pharmaceutical company in Mexico

“Our hotels have very high requirements for the quietness and safety of hot water supply. Huanuo’s vacuum hot water boiler operates very quietly and maintains a stable water temperature—guests hardly notice the equipment is there. Since the upgrade, hot water complaints have dropped significantly, and management has become much easier.”

Ahmed Hassan.

Head of Engineering, a hotel group in Egypt

“The stenter machines in our dyeing and finishing process are very sensitive to thermal oil temperature stability. Huanuo’s thermal oil heater heats up quickly with minimal temperature fluctuation, and the finishing effect has improved noticeably. Fuel consumption is also considerably lower than that of the original equipment. Their after-sales service responds promptly, making the cooperation very smooth.”

Mehmet Yılmaz

Production Manager, a textile dyeing and finishing company in Türkiye

“Our washing workshop requires frequent steam on/off cycles and has limited space. Huanuo’s once-through steam boiler occupies a small footprint and produces steam within 2 to 4 minutes, fully keeping up with our pace. The steam is stable and operation is simple—very suitable for our high-intensity washing conditions.”

Rafiq Islam.

Operations Supervisor, a garment washing company in Bangladesh

“Food processing has strict requirements for both steam quality and emissions. Huanuo’s condensing steam boiler has high thermal efficiency and a low exhaust gas temperature, with NOx emissions far below local standards. It helped us easily pass environmental reviews, while natural gas costs have also dropped noticeably.”

Khalid Al-Farsi

Plant Manager, a food processing plant in Saudi Arabia

“We use local agricultural and forestry residues as boiler fuel. Huanuo’s biomass steam boiler has strong fuel adaptability and runs stably, which not only reduces fuel costs but also eases solid waste disposal pressure. Emission indicators meet local environmental requirements, and the overall benefits have exceeded expectations.”

Johan van der Merwe

Energy Manager, a beverage producer in South Africa

“Chemical plants have extremely high requirements for heat source continuity. The waste heat boiler customized by Huanuo fully recovers waste heat from process tail gas and produces steam stably, significantly reducing the cost of purchased steam. Since commissioning, the equipment has operated reliably and provided real help for our energy-saving and consumption-reduction efforts.”

Rajesh Kumar

Technical Director, a chemical company in India

“Our region has long winters and extremely low temperatures, so heating equipment must withstand severe conditions. Huanuo’s hot water boiler starts quickly and supplies heat stably even in low-temperature environments. Throughout the entire heating season, there were no unplanned shutdowns, and our residential heating guarantee capability has improved markedly.”

Dmitry Ivanov

Operations Manager, a district heating company in Russia

“Our exported fruits and vegetables have very high requirements for drying color and moisture content. Huanuo’s hot air furnace provides precise temperature control and clean hot air. After drying, the fruits and vegetables retain a natural color and stable quality, fully meeting export standards. Energy consumption is also lower than that of the original equipment, giving us more reliable capacity during peak season.”

Camila Rojas

Production Head, a fruit and vegetable processor in Chile