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No Hot Water

A tank weeping from its body rather than a fitting is done, so shut off its water and the gas or breaker feeding it and call.

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When this becomes an emergency

What a pro does

A plumber separates two failure patterns immediately. No heat at all sends attention to the burner, the thermostat or the elements. Heat that runs out early points at capacity, and on the Front Range that generally means sediment, since hard water drops minerals into the bottom of a tank with every cycle and that layer takes up volume the heater used to have. Altitude enters the picture on gas units. Air is thinner up here, combustion behaves differently than it does at sea level, and a heater that's set up or vented for lower elevation will burn poorly, short cycle or fail to hold a flame. Draft matters more than people expect. The plumber checks the venting and the combustion air supply as part of the job, particularly in a tight, well sealed home or a mechanical closet that's had other appliances added to it over the years. Electric units get their elements pulled and inspected, since scale coats them here and a scaled element runs hot and quits early. What the inspection shows decides between a service, a part, and a replacement.

Frequently asked questions

It does. Thinner air changes the fuel to air ratio a burner sees, so appliances often need to be configured for the elevation they're installed at. A unit that's wrong for its altitude tends to show it as poor combustion, soot, or a flame that won't stay put.
Sediment on the tank floor is taking up room that used to hold water, and it also sits between the burner and what it's heating. The tank's rated size stops describing what it actually delivers, and recovery between showers gets slower at the same time.
It isn't an emergency by itself. The noise is water flashing to steam under a sediment bed and forcing its way up through it, and what it really signals is that the tank is working harder than it should. Left alone long enough, that accelerates the wear that ends the heater's life.
It means the valve is doing its job, and something is pushing temperature or pressure past the limit. That can be a thermostat problem, a thermal expansion issue in a closed system, or a failing valve. It's worth checking rather than capping, since that valve is the tank's safety device.

No Hot Water?

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