Short answer: Hot water boilers are high-capacity boilers that heat water under pressure to temperatures above its atmospheric boiling point. Due to the high pressure and temperature, they are subject to rigorous periodic inspections as pressure vessels.

Because hot water is kept under high pressure, a sudden pressure drop causes it to vaporize (flash), releasing a large amount of energy. Corrosion, a faulty safety valve, or loss of control poses a serious risk of explosion.

Periodic inspections verify the boiler casing, safety equipment, and pressure/temperature control systems, ensuring safe operation and legal compliance.

What is checked?

• Corrosion, cracks, and wall thickness in casings and tubes (UT)
• Safety valve opening pressure and capacity
• Pressure and temperature limiting/cutting systems
• Pressure gauge, thermometer and level checks.
• Feed water and conditioning (water quality)
• Burner management and fuel shut-off safety features.

Method and Standard

Inspection includes internal/external visual inspection, ultrasonic wall thickness measurement, and functional testing of safety systems. Safety requirements for steam and hot water boilers. TS EN 12952/12953 It is based on series and pressure equipment regulations. Water quality is a critical parameter for preventing corrosion and scaling.

Legal Basis and Period

Hot water boilers are subject to periodic inspections under Law No. 6331 and Annex III; these inspections must be carried out by authorized personnel and supported by a TÜRKAK accredited report.

Common Nonconformities

• Thinning of wall thickness due to corrosion/erosion.
• Failed or leaking safety valve
• Deactivated pressure/temperature limiters
• Scale and corrosion due to lack of water treatment.

Frequently Asked Questions

What standards are used to evaluate hot water boilers?

TS EN 12952/12953 series and pressure equipment requirements are taken as a basis.

Why is water quality important?

Inadequate conditioning leads to corrosion and scaling, consequently a loss of strength.

What is the duration?

Unless otherwise specified, the pressure test is performed at least once a year; the pressure test period is determined separately.

Document Your Security

For accredited boiler and pressure vessel inspection. Mechanical Equipment Inspections Check out our page; mandatory periodic inspection Check our guide.