Experiencing fluctuating hot water temperatures can be frustrating and indicate underlying issues with your heating system. Here are common reasons why your hot water may keep going cold:

1. Lack of Hot Water

• Thermostat Setting: Check the thermostat on your boiler or hot water cylinder. Incorrect settings or a faulty thermostat can prevent the water from reaching the desired temperature.
• Sediment Buildup: Sediment or scale buildup in the hot water tank or pipes can restrict water flow and heat transfer, resulting in inconsistent hot water supply.

2. Boiler Issues

• Pressure Loss: Low boiler pressure can cause the heating system to shut down or reduce hot water production. Check the pressure gauge and repressurise the boiler if necessary.
• Faulty Diverter Valve: In combi boilers, the diverter valve directs hot water either to the taps or the heating system. A faulty valve may cause hot water to fluctuate or not flow properly.

3. Insufficient Insulation

• Pipes: Poorly insulated pipes can lose heat as hot water travels from the boiler to taps or showers. Insulating pipes can help retain heat and improve hot water delivery.

4. External Factors

• Peak Demand: High demand for hot water, such as during morning showers, can strain the heating system’s capacity, resulting in temporary cold water fluctuations.
• Weather Conditions: Extremely cold weather can affect the efficiency of external components, such as condensate pipes, causing boiler shutdowns or reduced performance.

5. Maintenance and Repairs

• Regular Servicing: Schedule regular boiler servicing to maintain efficiency and identify potential issues before they escalate.
• Professional Inspection: If problems persist, contact a qualified heating engineer to inspect your system. They can diagnose the underlying cause and recommend appropriate repairs or adjustments.

Conclusion

Understanding why your hot water keeps going cold requires identifying potential causes related to thermostat settings, boiler issues, insulation, and external factors. At Mercer Plumbing and Heating, we offer expert diagnosis and solutions for hot water problems. Contact us to learn more about maintaining consistent hot water supply and ensuring your heating system operates efficiently in Bearsden, Bishopbriggs, Clydebank, Jordanhill and Milngavie.