Hot water systems · Priority

Calorifier Not Heating

The calorifier receives steam or hot water but the stored water stays cold.

This fault is normally treated as priority work because the plant is still running but is damaging itself or wasting energy while it does.

Sites with long, poorly insulated pipework lose more heat in distribution than most owners expect, which reads as a capacity problem at the outlet.

069 268 0988 info@reyds.co.za

Equipment: Hot water systems
Priority: Priority
Call: 069 268 0988

What we find

Likely causes

Failed steam control valve or actuator
Steam trap failed closed flooding the coil
Scaled or perforated coil
Blocked strainer ahead of the valve
Thermostat or sensor failure

Test sequence

How we diagnose it

Valve stroke and actuator test
Trap condition test
Coil hydraulic pressure test
Strainer inspection and temperature survey

Repair route

Services that resolve this fault

Hot Water Geyser Repairs

Element, thermostat, valve and leak repairs on electric geysers.

5 000 Litre Hot Water Geyser Repairs

Large-volume storage geyser repairs, elements, thermostats and stratification.

Industrial Hot Water Systems

Design, repair and optimisation of bulk hot water plant.

Calorifier Repairs

Steam and hot water calorifier coil, control valve and tank repairs.

Hot Water Storage Tank Maintenance

Descaling, anode replacement and integrity checks on storage vessels.

Emergency Breakdown Service

Priority attendance for total hot water or steam loss.

Coverage

Attendance by area

Also check

Related faults

Hot Water Geyser Not Heating

No hot water at the taps although the geyser has power and water.

5 000 Litre Geyser Not Heating

A large storage geyser is not reaching temperature or recovers far too slowly.

Commercial Hot Water System Failure

The site loses hot water during peak periods while plant appears to be running.

Low or No Hot Water Pressure

Hot water pressure is much weaker than cold, or fluctuates at the outlet.

FAQs

Frequently asked questions

What causes calorifier not heating?

The usual causes are failed steam control valve or actuator, steam trap failed closed flooding the coil, scaled or perforated coil, blocked strainer ahead of the valve. Which one it is can only be confirmed by measurement, not by symptom alone.

How do you diagnose it?

Valve stroke and actuator test; Trap condition test; Coil hydraulic pressure test; Strainer inspection and temperature survey. The readings are recorded so the repair decision is based on data.

Can I keep using the system in the meantime?

Usually yes, for a short period, but efficiency and component life are both being lost while the fault persists.

Where do you attend this fault?

Across Johannesburg, Ekurhuleni, West Rand, Midrand, Centurion and Pretoria.

Get calorifier not heating diagnosed

Priority attendance across Johannesburg, Ekurhuleni, West Rand, Midrand, Centurion and Pretoria.

069 268 0988 Request a quote