Lukewarm Water, Then Cold
On an electric tank, a burned out element or a failed thermostat cuts hot water short. On a gas tank, the burner or gas valve is the first suspect.
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WATER HEATERS
Repair and replacement of gas, electric and tankless water heaters in Des Moines homes, with the vent, gas drop and relief piping checked against the city's installation rules.
OVERVIEW
Water heater repair restores a working unit by replacing the part that failed, such as an element, thermostat, gas valve, burner assembly or relief valve. Replacement removes the old heater and installs a new one with its water, gas and vent connections brought to current code. We at Clog Busters do both for Des Moines homes from our branch at 3950 Vandalia Road, open 24 hours a day, 7 days a week.
Replacing a water heater in Des Moines is permitted work that ends with a city inspection. The City of Des Moines Permit and Development Center water heater installation requirements call for a permit, an inspection once the installation is complete, and specific rules for the cold water shutoff, relief piping, vent connector, combustion air and gas drop.
See our water heater services and our Des Moines drain and sewer service. A tank leaking right now is a job for our emergency plumbing in Des Moines.
Water heater installations follow the 2024 Uniform Plumbing Code, in force in Iowa since March 26, 2025, and the City of Des Moines water heater installation requirements.

WARNING SIGNS
Each of these signs tells us which part to test before anything is replaced.
On an electric tank, a burned out element or a failed thermostat cuts hot water short. On a gas tank, the burner or gas valve is the first suspect.
Sediment on the tank bottom traps water beneath it, and that water boils up through the layer. The buildup also slows recovery.
Discolored hot water with clear cold water points to the heater, not the supply. A spent anode rod lets the tank start corroding from the inside.
A temperature and pressure relief valve that keeps opening signals high temperature, high pressure or a worn valve. Thermal expansion in a closed system is a frequent cause.
A leak at a fitting, the drain valve or the relief valve can be repaired. Water seeping from the tank body cannot, and that heater needs replacing.
Discoloration around the top of a gas heater means exhaust is spilling instead of rising up the vent. Stop using the heater until the vent is checked.
WATER HEATER SERVICES
Gas, electric and tankless units, from one failed part to a complete replacement.
Elements, thermostats, gas valves, thermocouples, burners, dip tubes and relief valves tested and replaced on gas and electric tank heaters.
Ignition and flame faults diagnosed, and heat exchangers descaled when mineral buildup restricts flow and makes the unit shut itself down.
The new heater is sized to the household's peak hot water use and the recovery it needs, not only to the gallon figure on the old label.
Des Moines warns that the gas pipe may need upsizing to carry a tankless heater's larger Btu demand. We size the gas line and plan the vent before recommending one.
Vent connectors pitched upward, fastened with three screws per joint and kept clear of combustibles, fed by a rigid black iron gas drop with a drip leg.
Where a check valve, backflow preventer or pressure regulator closes the system, an expansion tank absorbs the water a heater pushes out as it warms.
WHY CLOG BUSTERS
Test the unit, check the installation, price both options, then install and verify.
We check the elements or burner, thermostat or gas valve, anode rod, relief valve and tank shell to find the part that failed.
Vent pitch and clearances, combustion air, the gas drop, the cold water shutoff and the relief line are measured against the city requirements.
You get the repair cost and, when the tank is near the end of its life, a replacement cost. You decide before work begins.
The old heater is drained and hauled out. The new one gets a dedicated cold shutoff, listed water connectors, a rigid relief line and a properly pitched vent.
We fill the tank, light or power it, check each joint for leaks and confirm the vent draws. The city final inspection needs at least 24 hours of notice.
FAQ
Still stuck? Call the Des Moines shop at (515) 259-1991.
Yes. The City of Des Moines Permit and Development Center lists a permit for the water heater installation as its first requirement. When the installation is complete, the Permit and Development Center is notified to schedule an inspection, and the final inspection must be booked at least 24 hours ahead with the permit number on hand. We explain how the permit applies to your job before work starts.
The city requires the temperature and pressure relief piping to be rigid pipe and does not allow PVC or other plastic. Its installation drawing shows a three-quarter inch pipe with no threads on the end, finishing at least 6 inches and no more than 24 inches above the floor. The valve itself sits on top of the tank or within the top 6 inches of its side.
The city requires 50 cubic feet of combustion air for every 1,000 Btu of the heater's input. Its own worked example puts a 50,000 Btu heater at 2,500 cubic feet. A heater closed into a small utility room may need added louvers or air brought in from outside to meet that. Without it, exhaust can spill into the house.
Often, but the gas line decides. The city installation requirements state that gas pipe size may need to be increased to handle the added Btu demand of a tankless heater, and that the manufacturer's installation instructions apply in full. A tankless unit also needs its own vent route. We size the gas piping and plan the vent before quoting a conversion.
Repair makes sense when a replaceable part has failed and the tank is sound. A tank that leaks from its body, or shows heavy internal corrosion, needs replacing because the steel itself has failed.
You need one when the water system is closed. Water expanding in a heating tank can normally push back toward the public main, but a check valve, backflow preventer or pressure regulator on the service blocks that path. Pressure then climbs with every heating cycle, and the relief valve may start to drip. Des Moines city code names Des Moines Water Works and the building official as the authority for backflow containment, so check what sits on your service line.
Regularly, to clear sediment, and Des Moines Water Works calls draining a good maintenance practice for any water heater. The utility describes closing the inlet valve, shutting off the gas or electric supply, and opening the drain valve near the bottom of the tank. Keep the gas or power off until the tank has refilled, since the utility warns that heating an empty tank can damage it or start a fire.
Somewhere it can be reached and removed. The city requires that a water heater come out without removing any permanent part of the building, and access cannot pass through a bedroom, bathroom, toilet room or storage closet. Single wall metal vent pipe needs 6 inches of clearance from combustible materials, and double wall B-vent needs 1 inch. A replacement that cannot meet those rules in the old spot may need to move.
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