Water Heater Installation in Des Moines, IA
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What a new water heater in Des Moines has to deal with
Winter nights here average 16°F from December through February, and homes need heat from October through May, eight months of the year. A water heater installed here has to hold up through a long, cold stretch, not just a few weeks of frost.
The federal minimum efficiency for storage water heaters isn't one number. It's a formula based on the tank's rated volume, applied separately depending on how much hot water a household draws in a day, so two tanks of different sizes can face different minimums. Worth knowing which one applies to the unit going into your house.
Power loss is also worth planning for. Fifteen percent of Iowa households went at least 24 hours without power in 2024, and Polk County has seen 21 winter storms and 191 damaging wind events over the past ten years. A gas water heater with a standing pilot keeps making hot water through an outage. One with electronic ignition, gas or electric, needs power to fire.
- 16°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?
- Age is the first thing to check. Most tank water heaters last a decade or so, and once you're near that mark, a repair is just a delay before the next one. Watch for water pooling around the base, rust at the fittings, or water that never gets quite hot enough anymore. If the tank itself is leaking, that's not a repair, since the tank can't be patched. A contractor can tell you what shape the tank is in and whether it's worth fixing or time to replace it.
- Should I switch to a tankless water heater?
- It depends on what you want out of it. A tankless unit heats water on demand instead of storing it, so you don't run out partway through a shower, and it isn't keeping a tank of water hot all day when nobody's using it. It also takes up less space, since there's no tank to fit. The tradeoff is that installing one often means changes to the gas line, venting or electrical setup to match what the unit needs, which a tank system may already have in place. A contractor can look at your current setup and tell you what switching would actually involve in your house.
- What changes when you install a tankless water heater?
- The unit itself is smaller and usually goes on a wall instead of the floor, so where it sits in your home will likely change. Because it heats water as it flows through rather than storing it, it often needs a gas line sized for its higher demand, and venting built for how it exhausts, which is different from a tank system. Some installs also call for electrical work to power the unit's controls. A contractor will check your gas line, venting and electrical against what the new unit needs before the work starts, and a permit and inspection from the local building office apply either way.