The water from the explosion is scalding hot and can leave you with burns. Finally, the water heater is made of metal, which can turn into dangerous shrapnel in an explosion. Any one of these things would be dangerous on its own; together, they are an absolute disaster. The explosion also causes property damage.
Excessive Pressure Levels
Each tank will have a rating. If pressure levels exceed the rating, pressure escapes through the pressure relief valve. However, if the pressure relief valve doesn't open as designed, the pressure will build up inside of the tank until it explodes.
Apart from the obvious threat of water damage, burst tanks do not always automatically shut off, and the heating element could continue to run for hours if nobody is around to shut the power off.
A water heater explosion produces enough force to completely destroy your home. Water heaters rely on both pressure and high temperatures.
The popping noise comes from water that is boiling underneath the sediment. While the noise itself is harmless, too much sediment can: Eventually cause a leak—Sediment slows heat transfer from the gas burner to the water.
If your water heater is leaking around the seams, the tank may need to be replaced. If the temperature/pressure relief (TPR) valve is dripping and pooling around the bottom of the tank, that could be a sign of dangerous pressures developing inside the tank.
Bad Thermostats
The thermostat's role is to regulate the water temperature inside the tank. If a thermostat is malfunctioning, it can cause the water heater to overheat, leading to a circuit overload and tripping the breaker.
A water heater explosion can cause significant damage to your home, and thankfully, most homeowners insurance policies do cover such events. However, the coverage may be subject to certain conditions, such as proper maintenance and adherence to safety codes.
Popping Noise
Another sign of a potential explosion waiting to happen in your water heater would be those frequent popping noises you hear as sediment buildup settles to the bottom of the tank. The sediment blocks the heating element, creating a barrier between the heat source and the water in the tank.
Generally all water heaters come fitted with a thermostat which can be set for the desired water temperature. Once this is set, the water will heat to that temperature and the heater cuts off. So there is no risk of exploding, even if left for too long. There will be only power wastage.
Even if the problem starts small, a crack or spot of rust can quickly lead to tank leaks if you aren't careful. As we've already mentioned, a leaking water heater is an emergency and should be handled with a sense of urgency.
As mentioned earlier, in many cases, it's safe to shower even if your water heater is leaking. Small leaks typically don't affect the performance of the water heater, and you can continue to use hot water as normal until the leak is fixed.
Over time, sediment can build up at the bottom of your tank (which is why we suggest flushing it twice a year). If too much sediment builds up, water and air can get stuck underneath it and cause a pressure buildup and popping noises to occur. This can then cause your water heater to explode or burst.
Water heaters have an average lifespan of 10–20 years, but that can be significantly reduced without proper routine maintenance—substantially increasing the risk of failure. According to an IBHS study, 69% of all water heater failures result from a slow leak or a sudden burst.
If there is the electric heating element explosion, it's very likely that it's getting very damp. Once the magnesium oxide powder is severely affected by the electric heating, the water evaporates rapidly, and the metal tube may be blasted when the pressure is high.
Water heaters show several signs of going bad, including lack of hot water, temperature fluctuations, decreased water pressure, strange noises, rotten egg smell, visible leaks, rusty or discolored water, and increased energy bills. If your water heater is over 10 years old, it may be time to consider a replacement.
How Common Are Water Heater Explosions? Thanks to modern safety features and regulations, water heater explosions are rare. In 2022, 108 incidents involving hot water heaters were reported to the United States Consumer Product Safety Commission.
Warning Signs Your Water Heater Needs Replacement
Leaking or rust-colored water around the tank. A completely drained and non-functioning tank. Faulty pressure relief valve. Loud rumbling or banging noises.
If your water heater is popping, vibrating, or rumbling, the likely culprit is sediment or scale buildup on the inside of the tank. Sediment and scale are just loose minerals that exist in all forms of water.
If your water heater unexpectedly bursts or leaks, the water damage caused by the leak will usually be covered by homeowners insurance. However, repairs or replacement of the water heater itself will not be covered.
While today's water heaters are better designed than older models, they still require regular maintenance in order to prolong their lives. With regular inspection, draining, and flushing, you can expect a gas water heater to last anywhere from 8-12 years and an electric water heater to last anywhere from 10-15 years.
Fire insurance for individuals is provided by homeowners insurance, which covers not only the peril of loss or damage by fire, but also a whole series of other causes of loss, such as wind, theft, explosion, and so forth. Fire insurance for entities, including businesses, is provided by Commercial Property Insurance.
If too much pressure builds up inside your water heater, it will eventually burst. Water heaters feature a temperature and pressure relief valve, but over the years, the pressure can still wear down your tank.
The furnace blower motor wiring can wear down and lead to arcing and short circuits or ground faults, which will trip the furnace breaker. Other furnace parts that use electricity may also malfunction, with the same result. The solution: Call for furnace repair.
Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a 30-amp double-pole breaker and 10-2 non-metallic (NM) or MC cable.