What causes solar hot water systems to rumble or make banging sounds?
We are often asked, “Why is my hot water system making a banging noise”?
“Why does my solar hot water tank rumble when I turn a hot tap on”?
“Is the crackling noise I hear in my solar hot water system normal”?
Why does a solar hot water system rumble?
The reason your solar hot water system will make a rumbling sound or crackling noise when you turn a hot tap on has a lot to do with heat. This heat is generated in the solar hot water collectors. It is actually the sound of water in your collectors, solar return pipes and storage tank changing rapidly from a liquid to a gas.
This is usually the first sign that something is wrong with your system. It may be the result of a faulty sensor, solar pump, auto air bleed valve or controller. It may be that your collectors are oversized for your use. It may be that your solar hot water collectors are too flat on your roof. Or it may be just the result of a very hot day.
Overheating in solar hot water systems can reduce the life of your system. If the rumbling persists, it is time to call a solar hot water repair expert.
Why do hot water systems make banging noises?
There are numerous reasons why hot water systems make banging sounds.
Primarily it is likely to be an issue with the cold water inlet valves at the bottom of the hot water storage tank. These valves are spring loaded. As the springs age, they weaken, and no long have the force required to prevent the valves from bouncing.
The cause of the banging may not be originating from your hot water storage tank. Sound travels through water. The actual cause may be a faulty tap washer, a leaking toilet or a solenoid valve on a washing machine or dish washer.
Banging noises in hot water systems is not likely to cause any damage to the system. However, it can become annoying and what ever is causing the damage is likely to get worse.
When this occurs, do not panic. Just be aware that you may need a plumber soon.
If you have issues with banging noises in your hot water system or rumbling in your solar hot water system we can help.