Water Heater Installation in Janesville, WI
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What a Janesville winter asks of a water heater
Your water heater works against cold ground water for eight months of the year here, October through May, with winter nights averaging 16°F. It runs longer to bring incoming water up to temperature, and it does that for most of the year, not just a few weeks in the deep cold.
Power outages happen too. About 18% of Wisconsin households went at least 24 hours without power in 2024, and Rock County has seen 17 winter storms and 78 damaging wind events over the past ten years. A gas water heater with a standing pilot keeps making hot water when the power drops. One with electronic ignition will not light until the power is back. Federal efficiency minimums for storage water heaters are set by the tank's rated volume, applied differently across draw patterns, so two tanks of different sizes are held to different numbers even when they are the same type.
- 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?
- The clearest sign is water that isn't hot anymore, or runs out fast when it used to last. Rust colored water, a tank that's rusting or bulging on the outside, or puddles forming around the base mean the tank itself is failing and that doesn't get better. A popping or rumbling sound during heating usually means sediment has built up on the bottom of the tank, and once that starts, the tank works harder than it should to do the same job. If you're seeing any of these signs, it's worth having a contractor look at it before it fails outright, especially with cold winters here putting real demand on hot water.
- Should I switch to a tankless water heater?
- It depends on what you want out of it, not on whether your current tank is old. A tankless unit heats water as you use it instead of storing it, so you don't run out of hot water during a long shower or back to back loads of laundry. It also takes up much less space than a tank. Switching means changing how the unit is vented and how it draws gas or power, since a tankless system has different requirements than a storage tank, so a contractor will need to check whether your home's setup can support that before you decide.
- What changes when you install a tankless water heater?
- The biggest change is that hot water gets made on demand instead of sitting ready in a tank. That means no standby heat loss from a tank keeping water hot all day, but it also means the unit needs enough gas supply or electrical capacity to heat water fast enough for your fixtures. Venting is different too, since tankless units vent differently than a tank does, so the pipe running outside may need to be relocated or resized. A contractor can walk through what your home's gas line, electrical panel, and venting can handle before any work starts.