Periodic Inspection of Central Heating (Hot Water) Boiler
Short answer: Central heating (hot water) boilers are closed vessels that heat water under pressure for heating purposes and, as pressure equipment, are subject to periodic inspections. Generally, they are inspected at least once a year, including body inspection, safety equipment checks, and expansion system checks.
Although hot water boilers operate at low pressure, a faulty safety valve, a clogged expansion line, or weakening due to corrosion can create a risk of excessive pressure and explosion.
Periodic inspections ensure both life safety and legal compliance by verifying that the boiler and associated safety equipment are operating safely.
What is checked?
- Corrosion and cracks on the casing, water tube/smoke tube surfaces.
- Safety valve opening pressure and discharge capacity
- Expansion tank/reservoir and pressure equalization
- Pressure gauge, thermometer and water level indicators.
- Burner and fuel shut-off safety devices
- Boiler room ventilation and chimney connection.
Method and Standard
Inspection includes internal/external visual inspection and functional testing of safety equipment. Design and safety requirements for hot water boilers. TS EN 12828 (Heating systems) are based on pressurized equipment regulations. The safety valve is verified at an opening value corresponding to the boiler's maximum operating pressure.
Legal Basis and Period
Central heating boilers are subject to periodic inspections under Law No. 6331 and Annex III; these inspections must be carried out by authorized personnel and documented with a report prepared by them.
Common Nonconformities
- Safety valve with insufficient capacity or leaking.
- Expansion tank without pressure/defective
- Loss of yield/strength due to corrosion and limescale.
- Missing or faulty pressure gauge/thermometer
2025 Legislative Update: Amendments to the Work Equipment Regulation
Regulation on Health and Safety Requirements in the Use of Work Equipment (Official Gazette 25.04.2013 / 28628), With the amendment published in the Official Gazette dated December 23, 2025, and numbered 33116. It has been updated. This change directly affects the framework governing periodic inspections and introduces some innovations that businesses should pay attention to.
- In order to comply with Law No. 6331, the phrase "accredited inspection body" in the legislation has been amended. ""equipment inspection organization"" It has been organized as follows.
- During the transition period, organizations accredited by TÜRKAK under TS EN ISO/IEC 17020 are considered "equipment inspection organizations" until the Ministry makes a new regulation (compliance schedule 1/1/2027).
- Without performing periodic inspection services at the latest 1 day before, It has been made mandatory for the employer and the authorized person to prepare and mutually approve a contract in accordance with the example in the OHS-KATIP system.
The periodic inspection periods have been essentially preserved with this change; inspections will continue to be carried out at least once a year unless otherwise specified in the relevant standard. This content is for informational purposes only; the current Official Gazette text should be considered for precise obligations.
Frequently Asked Questions
What impact did the December 23, 2025 legislative change have?
The Work Equipment Regulation has been updated with amendment number 33116 dated 23.12.2025. The term "accredited inspection body" has been changed to "equipment inspection body," it has become mandatory to sign a contract via ISG-KATIP at least one day in advance, and a transition period (1/1/2027) has been foreseen for TÜRKAK 17020 accreditation. Inspection periods have essentially remained the same.
According to which standard are hot water boilers evaluated?
For heating systems, TS EN 12828 and pressure equipment requirements are taken as the basis.
Why is a safety valve important?
It protects the boiler by relieving excess pressure; the opening pressure and capacity must be verified.
What is the duration?
Unless otherwise specified, at least once a year.
Document Your Security
for boiler control Mechanical Equipment Inspections Check out our page; mandatory periodic inspection Check out our guide.