Low-Nitrogen Vacuum Hot Water Boiler Project at an International General Hospital in Bangkok, Thailand

Project Overview

An international general hospital in Bangkok is a major comprehensive medical institution in the area, with an average daily outpatient volume exceeding 3,000 visits and over 800 inpatient beds. It places extremely high demands on the stability and environmental sustainability of its heating and hot water supply systems. Previously, the hospital’s traditional gas-fired boilers exceeded nitrogen oxide emission limits, making it difficult to comply with increasingly stringent local environmental regulations. Additionally, the equipment generated significant noise during operation, disturbing patients’ rest, and suffered from issues such as large fluctuations in water temperature and high energy consumption. To address these challenges, the hospital conducted extensive research and evaluations before ultimately selecting two low-nitrogen vacuum hot water boilers supplied by Huano Boilers to comprehensively upgrade its heating system.

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Solution

To meet the hospital’s needs for round-the-clock constant-temperature heating, domestic hot water, and specialized heating requirements in medical areas, Huano Boilers configured two ZKS1.75-85/60-Q low-nitrogen vacuum hot water boilers for this project:

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Fully Pre-mixed Ultra-Low Nitrogen Combustion

The boilers utilize fully pre-mixed combustion technology, reducing nitrogen oxide emissions to below 30 mg/m³—far exceeding local environmental standards—and passing environmental agency inspections on the first attempt.

Vacuum Operation, Intrinsically Safe

The vacuum operation design maintains a constant negative pressure inside the furnace, eliminating the risk of explosion and ensuring the safety of hospital staff and equipment from the source.

Quiet Combustion System

Equipped with a dedicated quiet combustion device, operating noise is kept below 55 decibels, making it fully suitable for areas requiring a quiet environment, such as patient rooms and operating rooms.

Intelligent and Precise Temperature Control

The intelligent temperature control module precisely maintains water temperature within a range of ±1°C, ensuring stable heating in areas such as patient rooms and operating rooms and preventing water temperature fluctuations.

High Efficiency and Energy Savings, Reducing Operating Costs

The boiler’s optimized design features ample heat transfer surface area and high thermal efficiency. Combined with intelligent load regulation, this significantly reduces gas consumption.

Core Project Advantages

Successfully passed inspections by local environmental protection authorities, completely resolving the issue of excessive emissions.

Annual gas cost savings exceed $20,000, resulting in a significant reduction in operating costs.

Stable hot water supply and low noise levels have effectively improved the patient experience, earning unanimous praise from medical staff.

The equipment is easy to operate and runs safely and reliably, providing a solid foundation for the hospital’s efficient operations.

Client Testimonial

“Huanuo Boilers’ low-nitrogen vacuum hot water boilers meet environmental standards, operate quietly, maintain stable water temperatures, and have saved us a significant amount on costs. We are very satisfied—this has been a highly successful collaboration. If we have future needs, we will definitely choose Huanuo again.”

Somsak K.

Head of Facilities Management

“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