The Low Nitrogen Vacuum Gas Hot Water Boiler is a fully automatic commercial heating solution integrating ultra-low NOx premix combustion with negative-pressure vacuum phase-change heat transfer technology. Operating under continuous sub-atmospheric pressure, it provides high-efficiency, explosion-proof hot water delivery for commercial buildings, industrial facilities, and regional heating networks.

Key Technical Features

No Regulatory Inspection Needed
Negative-pressure operation eliminates explosion risk and bypasses annual pressure vessel inspections.
Ultra-Low NOx Emissions
Surface premix combustion achieves emissions under 30 mg/m³ without external flue-gas treatment.
High Thermal Efficiency
Phase-change condensing achieves up to 104% efficiency, reducing overall fuel consumption.
Zero Scale and Corrosion
Permanently sealed deaerated media prevents internal scale buildup and tube corrosion.
Full BMS Integration
PLC system enables automatic load adjustment, remote monitoring, and Modbus/Ethernet connectivity.

Parameter

Model	Rated evaporation rate(MW)	Rated Working Pressure(MPa)	Inlet/outlet water temperature(℃)	Thermal Efficiency(%)	Natural gas consumption(m³)	Shipping Weight(t)
ZKQ-0.35	0.35	1.0/1.25/1.6	70/50,50/40,80/60	>103	36.3	3.3
ZKQ-0.7	0.7	1.0/1.25/1.6	70/50,50/40,80/60	>103	72.6	5.1
ZKQ-1.4	1.4	1.0/1.25/1.6	70/50,50/40,80/60	>103	145.2	5.6
ZKQ-2.1	2.1	1.0/1.25/1.6	70/50,50/40,80/60	>103	217.8	6.8
ZKQ-2.8	2.8	1.0/1.25/1.6	70/50,50/40,80/60	>103	290.4	8.7
ZKQ-3.5	3.5	1.0/1.25/1.6	70/50,50/40,80/60	>103	363	10.2
ZKQ-4.2	4.2	1.0/1.25/1.6	70/50,50/40,80/60	>103	435.6	10.8
ZKQ-4.9	4.9	1.0/1.25/1.6	70/50,50/40,80/60	>103	508.2	17.7
ZKQ-5.6	5.6	1.0/1.25/1.6	70/50,50/40,80/60	>103	580.7	18.6
ZKQ-7.0	7.0	1.0/1.25/1.6	70/50,50/40,80/60	>103	726	23.8
ZKQ-10.5	10.5	1.0/1.25/1.6	70/50,50/40,80/60	>103	1089	32.2
ZKQ-14	14	1.0/1.25/1.6	70/50,50/40,80/60	>103	1452	41.5

Project Advantages

Flexible Installation
The vacuum, non-pressure vessel design allows installation in rooftops, basements, and compact mechanical rooms while helping simplify installation approval procedures where local regulations permit.
Intelligent Cascade Control
The master controller automatically stages multiple boilers according to heating demand, reducing unnecessary burner cycling and improving part-load operating efficiency.
Low-Noise Operation
An insulated enclosure and low-noise air intake system help reduce operating noise, making the boiler suitable for projects with strict acoustic requirements.

Customization Options

The boiler can be configured to match local fuel conditions, building loads, and project specifications.

Item	Options
Heat Output	Customized according to project capacity
Fuel Type	Natural Gas, LPG, Biogas
Burner Brand	Riello, Baltur, Weishaupt or specified brand
Control System	Siemens, Schneider, PLC
Communication	Modbus, RS485, Ethernet
Voltage	220V / 380V / 415V / 50Hz / 60Hz
HMI Language	English, Spanish, Russian, Arabic or customized
Installation	Skid-mounted or modular design

Quality Control & Factory Inspection Protocol

Every boiler is manufactured under a documented quality management process to ensure long-term reliability before shipment.
Incoming inspection for steel plates, burners, valves, and electrical components
Automated welding with non-destructive testing (RT/UT)
Vacuum chamber helium leak testing
Secondary heat exchanger hydrostatic pressure testing
Full-load firing and combustion adjustment
Electrical safety inspection
Factory Acceptance Test (FAT) before delivery

Packaging & Global Logistics

Heavy-duty steel skid for lifting and transportation
Moisture-proof protective wrapping
Export plywood crate or steel frame packaging
Complete export documentation included
Factory test report
Operation & maintenance manual
Electrical drawings
Piping diagram
Spare parts list
Packing list

FAQ

Q: What heating capacity should I select for my building?

A: Boiler capacity depends on the building area, insulation performance, climate conditions, and hot water demand. Our engineers can recommend the appropriate model after reviewing your project requirements.

Q: Can this boiler replace an existing steam or hot water boiler?

A: Yes. In many retrofit projects, the vacuum boiler can replace conventional gas-fired hot water boilers while utilizing existing heating pipelines with minor system modifications, subject to project evaluation.

Q: What maintenance is required during operation?

A: Routine maintenance mainly includes burner inspection, gas train checks, water pump servicing, and annual electrical inspections. Since the vacuum chamber is permanently sealed, internal cleaning and descaling are generally unnecessary.

Q: What is the expected service life?

A: Under normal operating conditions and scheduled maintenance, the boiler is designed for long-term commercial operation, with many installations remaining in service for more than 20 years.

Q: Can multiple boilers operate together?

A: Yes. Multiple units can be connected through cascade control to match seasonal heating demand, improve redundancy, and increase overall system efficiency for large commercial projects.

Q: What information is required before requesting a quotation?

A: To recommend a suitable model, we typically require:
Required heating capacity
Fuel type
Supply voltage
Installation location
Local emission requirements
Whether BMS integration is needed

Q: What documents are supplied with the boiler?

A: Each boiler is delivered with operating manuals, wiring diagrams, piping drawings, factory test reports, packing lists, and other export documents required for installation and commissioning.

Q: Is overseas commissioning or technical support available?

A: Yes. We can provide remote technical support, online commissioning assistance, spare parts supply, and on-site engineering service where required.

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