How to Fix Water Tank Noises

Overview

Noisy water tanks can be annoying and indicate a problem. This guide covers diagnosing and fixing water tank noises.

Step-by-Step Fix

1. Firstly, check your central heating system for trapped air, as this is a common cause of gurgling or knocking noises. Locate the bleed valve on your radiators (usually a small square or slotted screw on the top corner) and use a radiator key to slowly open each valve, allowing air to escape until water starts to trickle out. Work from the lowest radiator in your home upwards to ensure all air is released.
2. Next, verify that your water circulation pump is operating correctly, as a failing or struggling pump can generate humming, vibrating, or rattling sounds. Listen closely to the pump itself; if it's unusually loud, hot to the touch, or vibrating excessively, it may need professional inspection or replacement. You can also check if water is circulating properly by feeling the pipes leading to and from the pump – they should be similarly warm if the pump is working efficiently.
3. Confirm the pressure within your expansion tank (often located near your boiler or hot water cylinder) is at the correct level, as incorrect pressure can lead to banging or gurgling. Consult your boiler or tank manual for the recommended pressure range, typically displayed on a gauge on the tank itself. If the pressure is too low, you may need to re-pressurise the system according to your boiler's instructions, or if too high, release some pressure carefully.
4. Investigate all accessible pipework for any loose connections or pipes that are not securely fastened, as these can vibrate against walls, floorboards, or other surfaces, causing knocking or rattling noises. Gently tap along pipes to identify any that move freely, then secure them using pipe clips or insulation foam to prevent movement and reduce noise transmission. Pay particular attention to pipes near the tank, boiler, and any bends or junctions.
5. Finally, insulate any exposed hot and cold water pipes, especially those running through joists or against walls, to significantly reduce noise from water flow or pipe expansion and contraction. Use foam pipe insulation sleeves (available from DIY stores) cut to size and fitted snugly around the pipes, ensuring any gaps are sealed. This also has the added benefit of improving energy efficiency by reducing heat loss from hot water pipes.

Common Symptoms & Diagnostic Resolutions

Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.

Frequently Asked Questions