Water Heater Installation in Waukesha, WI
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What Waukesha winters ask of a new water heater
Winter nights here average 16°F from December through February, and homes need heat running from October through May, eight months of the year. A new water heater has to hold up through that stretch, working alongside a furnace that's rarely off.
Power is part of the picture too. Wisconsin saw 18% of households lose power for at least 24 hours in 2024, and the county has logged 18 winter storms and 103 damaging wind events over the past ten years. A gas water heater with a standing pilot keeps working through an outage. One that relies on an igniter will not light again until power is back. And when you're picking a new tank, the federal minimum efficiency isn't one number. It's set by a formula tied to the tank's rated volume, applied separately across four draw patterns, so two tanks of the same type can answer to different minimums depending on size.
- 16°F
- the average winter night, and colder incoming water means longer heating
- 8 months
- October through May, the months homes here need heat
- 18%
- of Wisconsin 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 $330 a year to run in Wisconsin compared with an electric water heater.
Estimates for a typical Wisconsin home, from EIA household energy data and Wisconsin 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. Once a tank water heater is old enough that a repair costs nearly what a new one would, replacing it is the better move. Watch for water that takes longer to heat, rusty water from the hot tap, or water pooling around the base of the tank. Rust in the water usually means the tank is corroding from the inside, and that only gets fixed by replacing it. If your heater is old and starting to act up before winter, it's worth replacing it before it fails on a night when you need hot water most.
- Should I switch to a tankless water heater?
- It depends on what you want out of it, not just on your current heater's age. A tankless unit heats water on demand instead of storing it, so you don't run out partway through back-to-back showers. The tradeoff is that a tankless install usually means changes to the gas line, venting, or electrical to match what the new unit needs, so it's rarely a straight swap. A contractor can look at your current setup and tell you what changing over would actually involve in your house.
- What changes when you install a tankless water heater?
- The biggest change is that a tankless unit needs more from your home's gas line, venting, or electrical than a tank ever did, because it's heating water in real time instead of drawing off a stored supply. Gas tankless units often need a larger gas line to deliver enough fuel on demand. Venting is different too, usually a dedicated vent sized for the new unit rather than the old tank's flue. Where the tank sat in a closet or corner, the tankless unit mounts on a wall, which frees up that floor space but means new connections have to be run to wherever it's placed. A contractor can walk through your existing setup and tell you exactly what needs to change.