Water Heater Installation in Marshalltown, IA
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What Marshalltown winters ask of a water heater
Your water heater works to make up for cold groundwater eight months a year here, October through May, with winter nights averaging 14°F. The colder the water coming in, the harder the unit works to bring it up to temperature, and that load falls on it for most of the year, not just a few weeks.
Power is part of the picture too. Statewide, 15% of Iowa households lost power for 24 hours or more in 2024, and Marshall County has logged 21 winter storms and 65 damaging wind events over the past ten years. A gas water heater with a standing pilot will keep making hot water through an outage. One that relies on electronic ignition or a powered vent won't, until the power is back. Whichever you choose, it has to meet the federal minimum efficiency for its size, and that minimum is set separately for each tank volume, so the number that applies to your new one depends on how many gallons it holds.
- 14°F
- the average winter night, and colder incoming water means longer heating
- 8 months
- October through May, the months homes here need heat
- 15%
- of Iowa households lost power for a day or more in 2024, and a heater with an electric element or electric ignition stops without it
NOAA nClimDiv, 1991–2020 normals
A heat pump water heater would save about $280 a year to run in Iowa compared with an electric water heater.
Estimates for a typical Iowa home, from EIA household energy data and Iowa fuel prices. Your home will differ.
- How do I know it's time to replace my water heater?
- Watch for water pooling around the base of the tank. That's rust working through the steel from the inside, and once it starts leaking there, it won't stop. Other signs are water that's not as hot as it used to be, a tank that's making rumbling or popping sounds from sediment buildup, or a unit that's more than 10 to 15 years old. If a contractor tells you the tank itself is leaking, that's not a repair, that's a replacement, since a punctured tank can't be patched.
- Should I switch to a tankless water heater?
- It depends on what you want out of it, not on whether tankless is better in general. A tankless unit heats water only when you're running a tap, so it doesn't hold a reserve that can run out during back to back showers. It also takes up less space than a storage tank. Against that, a tankless unit needs its own venting and gas line sized for its burner, which is different from what a storage tank uses, and a contractor will need to check whether your gas line and vent can support one before you commit. A licensed contractor can walk through what your house would need.
- What changes when you install a tankless water heater?
- The venting changes first. A tankless unit vents differently than a storage tank, so the existing vent pipe usually can't just be reused. The gas line often needs to be resized too, since a tankless unit's burner draws more gas at once to heat water on demand instead of maintaining a tank. Where it sits in the house can change as well, since tankless units mount on a wall and don't need floor space the way a tank does. In Marshalltown, replacing a water heater needs a permit from the local building office and an inspection once the work is done, and that applies whether you're switching types or replacing like for like.