Water Heater Installation in Arnold, MO
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What a water heater in Arnold has to deal with
Winter nights here average 25°F from December through February, and the cold runs October through April. That's seven months where the incoming water is cold and a new water heater has to work harder to bring it up to temperature.
Jefferson County has seen 11 winter storms and 53 damaging wind events over the past ten years, and in Missouri, 19% of households went at least 24 hours without power in 2024. A gas water heater with a standing pilot keeps working through an outage. One that relies on an electric igniter does not, until power comes back. Whatever gets installed has to meet the federal minimum efficiency for its size and type, since that standard is set by the tank's rated volume rather than one number for every heater.
- 25°F
- the average winter night, and colder incoming water means longer heating
- 7 months
- October through April, the months homes here need heat
- 19%
- of Missouri 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 $270 a year to run in Missouri compared with an electric water heater.
Estimates for a typical Missouri home, from EIA household energy data and Missouri fuel prices. Your home will differ.
- How do I know it's time to replace my water heater?
- Watch for water that never gets fully hot, rusty or metallic-smelling water, or rust showing up around fittings or at the seams of the tank. Puddles at the base are another sign, and they mean the tank itself has a leak rather than a fitting that can be tightened. Age matters too. If yours is old and starting to give you trouble, a repair may only buy a short time before it fails for good. Winters here run cold, with nights averaging 25°F from December through February, so a tank that fails in that stretch leaves you without hot water when you need it most.
- Should I switch to a tankless water heater?
- It depends on what you want from your hot water and what your home can support. A tankless unit heats water only when you run a tap, so you won't run out during a long shower or back to back loads of laundry the way you can with a tank. But installing one often means changes to the gas line, venting, or electrical, since tankless units draw more power at the moment they fire than a tank heater does. A contractor can look at your home's gas and electrical setup and tell you what switching would involve for your house specifically.
- What changes when you install a tankless water heater?
- The biggest change is that hot water becomes limited by flow rate instead of tank size. A tankless unit can supply hot water for as long as you need it, but only up to a certain number of gallons per minute, so running two showers and a dishwasher at once can still stretch it thin. The installation itself usually calls for a larger gas line or dedicated electrical circuit, depending on the unit, plus venting built for the higher temperatures tankless units produce. Because of these changes, sizing and installing a tankless unit is a different job than swapping one tank for another, and it's worth having a contractor confirm what your home needs before you decide.