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Top-Rated Water heater pros in Plain - Updated Nov 2026

Avatar for Cardinal Heating & Air Conditioning
Cardinal Heating & Air Conditioning
4.8(
165
)
Water Heater - Install or ReplaceWater Heater - Repair or ServiceTankless Water Heater - Repair

Serving Plain, WI and surrounding areas

Approved

In business since 1984

Free estimates

Emergency services offered

"We were pleased to work with Greg Mair who came to.our house the night of Jan17, 2024 after our 14 year old furnace died. He reviewed our entire system and made recommendations that fit our needs correctly. He arranged for a new furnace to be installed the next day and provided us with space heaters to be used until the work was completed. We will definitely call on Greg for any future needs."
Cardinal Heating & Air
Cardinal Heating & Air
Cardinal Heating & Air
Cardinal Heating & Air
Cardinal Heating & Air

+15

102 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Harker Heating & Cooling
Harker Heating & Cooling
4.6(
213
)
Solar Water Heater System - InstallTankless Water Heater - InstallTankless Water Heater - Install - For Business+6 more

Serving Plain, WI and surrounding areas

In business since 1949

Free estimates

Emergency services offered

"

We had our water heater go out last week.  We noticed it when we woke up to take showers before work.  I called a few places and ultimately chose to go with Harker because the receptionist told me they would be able to come out and assess the heater and replace it the same day.  Our water heater is about 7 years old, so we figured there would be a good chance that it would cost the same amount the replace the water heater as to just fix the older one, so that is why I verified with her that they could fix it the same day.

 

We have a new rescue dog that is not good around men, so my SO came home from work (I had already taken the day off work for this) and she took the dog away from the house so we didn?t disturb the men while they worked.  As we expected, there were a few parts that were bad on the water heater and the cost would be similar to repair or to replace.  He was done looking at the water around 2:00 and he told me someone would call me for a quote.  I was confused as I was under the impression that they would replace it that same day per the lady on the phone.  Apparently, that was not the case.  This guy wasn?t even the guy who would replace the unit, the guy who would replace the unit was busy and they didn?t have a replacement unit. I was very frustrated and mad?I chose Harker because I was told they could do it all in one day or we both wouldn?t have taken off work.  I could have just let my dog outside for a little while for him to look at the water heater.  I paid roughly $120 for this diagnostic test.

 

We then called to speak with a manager at Harker.  They tried to get someone to come back out that night and replace the water heater but were unable to.  They did have someone sent out first thing the next morning and took about $50 off the service call, which was appreciated but didn?t cover the amount of money we lost at work for missing part of both days.  This all could have been avoided by having their receptionist give accurate information.  There are a ton of places in Madison I could have called to have my water heater replaced and I chose Harker because I was told they could do it that same day and if they couldn't have replaced it that day, they should have said so and I would have made other arrangements. 



Update to Harkers repsonse:

At no time did they ever offer to have the heater replaced that evening for overtime rate or we would have easily paid it instead of taking more time off work.  We were told that they could try to get someone out that night but were unable to.  The only reason we okay'd them to come back the next morning is we needed it replaced as soon as possible.  We did not call later in the day-- it was still in the morning when we called.  And, obviously we know that you cannot carry all kinds of equipment around with you, but I was told that it would be replaced that night, so that is the fault of your receptionist to give me misinformation. They will try to write this so they sound like this was our fault for not knowing that they don't carry all the equipment, need licensed plumbers, etc., but we know exactly what was told to us on the phone and exactly how the situationw as handled and it was handled poorly.  We stand by our original reivew and will choose to use another company in the future. 


"
87 W. Beltline Hwy
Carrier Distinguished Dealer Logo
Star of Madison Award
Recommended by89%of homeowners
Ernstmeyer Plumbing Co. LLC
5.0(
2
)
Water Heater - Install or ReplaceWater Heater - Install or Replace - For Business

Serving Plain, WI and surrounding areas

In business since 1997

Free estimates

Credit card accepted

Thadd Ernstmeyer Plumbing Company has 1 employee. Payments are due in full by cash, check or credit card at time services rendered. Credit is not extended to customers. We do offer financing. Customers can pre-qualify for financing that can demonstrate a financial hardship.

Recommended by100%of homeowners
K & N Services
3.6(
16
)
Solar Water Heater System - InstallTankless Water Heater - InstallTankless Water Heater - Install - For Business+6 more

Serving Plain, WI and surrounding areas

In business since 2006

Free estimates

Emergency services offered

Owner operated. I am Jack of all trades. No job to big or small. We do everything from hauling to painting , Plumbing electrical , rental unit turnovers , trash outs roofing , windows and doors. My contact information has been outdated on here for a while. sorry to any customers who tried to reach me. And as always a 20% VETERANS & senior discount.

Recommended by90%of homeowners
Water Heaters FAQs, answered by experts

While not all homes require a hot water heater expansion tank, they are necessary in most newer homes and are often mandated by local building codes. Codes typically require an expansion tank if your plumbing system is a 'closed-loop' system, which often includes a backflow preventer or pressure regulator on the main water line. Some municipalities have specific requirements. Installing an expansion tank on a closed system is crucial, as it prevents excess pressure that can damage your water heater and other appliances, potentially shortening their lifespan. However, tankless water heaters do not require an expansion tank.

Traditional gas or electric water heaters last an average of six to 11 years. However, with excellent maintenance, they can last up to 15 years. Heat pump water heaters, on the other hand, last an average of between 12 and 15 years and potentially longer with proper maintenance. In both cases, your home's water quality can be a determining factor regarding the lifespan of your water heater.

Several signs indicate your water heater may be failing or in need of replacement. Key indicators include:

  • Age: A water heater older than ten years is approaching the end of its typical lifespan.

  • Water Quality: If you notice rusty or discolored water from your hot water faucets, or a foul odor similar to rotten eggs or sulfur, it can signal internal corrosion.

  • Unusual Noises: Banging, rumbling, or popping sounds from the tank often mean sediment has built up, causing the unit to overheat.

  • Leaks: Any water pooling around the base of the tank or visible leaks are clear signs of failure.

  • Performance Issues: A decline in performance, such as water not getting hot enough, taking longer to heat up, low water pressure, or decreased efficiency, suggests the unit is struggling.

  • Visible Damage: Obvious rust and corrosion on the exterior of the tank can indicate a more serious internal problem.

While these signs often point to replacement, some issues may be fixable. It's best to consult a professional plumber to diagnose the problem before investing in a new unit.

The chemicals in a water softener can wear down the anode rod in the heater and shorten its life span. However, for most people, the benefits of the softener outweigh this potential drawback.

Have a plumber inspect the anode rod annually for damage, as replacing the anode rod is far less expensive than replacing the entire water heater.

A water heater is one of the heaviest hitters in your home, and it needs as much power as possible to help it run efficiently and effectively.

Your water heater should be on its own dedicated circuit breaker, with no other power sources running to it. This is required to meet the National Electric Code–and to ensure it runs as efficiently as possible.

The Plain, WI homeowners’ guide to water heater services

From average costs to expert advice, get all the answers you need to get your job done.