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TRUSTED BY WATERLOO, WI HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon63
    Verified water heater services reviews

Verified Reviews for Water Heater Service pros in Waterloo, WI

*The Angi rating for Water Heater Service companies in Waterloo, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Heater Service needs.

*The HomeAdvisor rating for Water Heater Service companies in Waterloo, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Heater Service needs.

Last update on September 22, 2026

Find Water heater pros in Waterloo

Avatar for Cardinal Heating & Air Conditioning
Cardinal Heating & Air Conditioning
4.8(
164
)
Water Heater - Install or ReplaceWater Heater - Repair or ServiceTankless Water Heater - Repair

Serving Waterloo, 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

94 neighbors recently requested a quote
Recommended by90%of homeowners
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Avatar for Southport Plumbing, Heating & Cooling
Southport Plumbing, Heating & Cooling
5.0(
16
)
Water Heater - Install or ReplaceWater Heater - Repair or ServiceTankless Water Heater - Install+1 more

Serving Waterloo, WI and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"They were fast and efficient. Great job! And very nice people, too!"
Triple Sump Pump
After
Before
Stack Before
Stack After

+4

21 neighbors recently requested a quote
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Avatar for Brisc Plumbing
Brisc Plumbing
4.7(
25
)
Water Heater - Install or Replace

Serving Waterloo, WI and surrounding areas

Approved

In business since 2018

Free estimates

Customers say: Quality work

"Absolutely 100% professional and respectful. I highly recommend these guys, we were in need of a new hot water heater, the job was completed on time as promised with zero mess left behind."
Response time2 hrs
Recommended by90%of homeowners
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Avatar for KJM Plumbing
KJM Plumbing
4.9(
27
)
Water Heater - Install or ReplaceTankless Water Heater - InstallTankless Water Heater - Install - For Business+5 more

Serving Waterloo, WI and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"I urgently needed my water softener replaced. He came the same day, made an adjustment to the tank so that the overflow faced the drain and stopped spilling brine onto the water heater. Then he returned the next day and replaced the water softener for a very reasonable price. Kurt responded quickly to texts and my needs."
Response time1 day
5 neighbors recently requested a quote
Recommended by87%of homeowners
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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 Waterloo, WI and surrounding areas

In business since 1949

Free estimates

Emergency services offered

"They provide a friendly service, I had a good experience with sales and service, and they are very efficient and clean."
87 W. Beltline Hwy
Carrier Distinguished Dealer Logo
Star of Madison Award
Recommended by89%of homeowners
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Avatar for Edwardson Plumbing LLC - Home Facebook
Edwardson Plumbing LLC - Home Facebook
4.5(
46
)
Water Heater - Install or ReplaceWater Heater - Install or Replace - For BusinessWater Heater - Repair or Service+1 more

Serving Waterloo, WI and surrounding areas

In business since 2001

Free estimates

"They came and worked quickly and efficiently to install my new hot water heater. Everyone I talked to was very friendly and accommodating."
Response time1 day
Recommended by97%of homeowners
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Avatar for Landmark Services Cooperative
Landmark Services Cooperative
4.8(
66
)
Solar Water Heater System - InstallTankless Water Heater - InstallTankless Water Heater - Install - For Business+6 more

Serving Waterloo, WI and surrounding areas

In business since 1931

Free estimates

Emergency services offered

"The 2 workers were on time and performed the required work to install and remove the old water heater. They seemed in a big hurry ti finish and did not ( in my opinion) check the gas lines. 2 days after the installation there were 2 gas leaks and I had to call MGE to fix."
Lennox Symmetry 35N
GD70 Starfire Fireplace
Recommended by96%of homeowners
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Avatar for Installations by JJC
Installations by JJC
5.0(
1
)
Water Heater - Install or Replace

Serving Waterloo, WI and surrounding areas

In business since 2017

Free estimates

At Installations By JJC, we are dedicated to customer satisfaction on every job. We specialize in the installation or full replacement of water heaters. Locally owned and operated, we're known in the area for our prompt service and attention to detail. Give us a call today!

Power Vent Water Heater
Direct Vent Water Heater
Hybrid Electric Water Heater
Sink & Faucet
Response time30 mins
Recommended by100%of homeowners
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Avatar for Atkinson Building & Grounds Maintenance LLC
Atkinson Building & Grounds Maintenance LLC
5.0(
6
)
Solar Water Heater System - InstallTankless Water Heater - InstallTankless Water Heater - Install - For Business+6 more

Serving Waterloo, WI and surrounding areas

In business since 2016

Free estimates

Emergency services offered

Atkinson Maintenance is more than just a maintenance company we do everything from HVAC service and Maintenance to your small handyman jobs and "honey to do lists"

Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+24

Recommended by100%of homeowners
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Water Heaters questions, answered by experts

Often, the first issue you might encounter is a lack or loss of power—this could be caused by a tripped switch or a failed heating element. If your hot water is not producing enough power and its size is not the issue, you might need to replace one of its heating elements. A leaking water heater could be caused by tank erosion.

While a water heater explosion is rare, it is a serious danger. Be aware of these critical warning signs:

  • Sulfur or Rotten Egg Smell: This is a major red flag, especially for gas water heaters. It can indicate a gas leak, which could ignite and cause an explosion.

  • Leaking Pressure Valve: If the temperature and pressure (T&P) relief valve is leaking, it may not be able to properly regulate internal pressure, creating a risk of bursting.

  • Shaking or Rumbling: Loud rumbling or shaking from the tank can be a sign of extreme pressure buildup.

  • Excessive Heat: If the exterior of the water heater feels unusually hot to the touch, the unit may be overheating dangerously.

  • Rust-Colored Water: This can be a symptom of severe internal corrosion that compromises the tank's integrity.

If you notice any of these signs, especially a gas smell, you must act immediately. Shut off the gas supply to the water heater and call a professional plumber right away to prevent a potential disaster.

You can use multiple tankless water heaters, but that doesn’t mean you should. Adding multiple tankless heaters adds considerable cost to your home in both parts and installation costs. Also, you’re adding many more points of failure in the system, making plumbing issues harder to diagnose. More heaters mean more maintenance, and insurers may want a word regarding the increased risk of water damage. A single, larger unit makes more sense in most situations.

There are pros and cons to tankless water heaters. They are more efficient than traditional tank water heaters, and maintenance costs are lower. These units are also much more compact. On the other hand, they cost about twice as much to install as traditional tank water heaters and are more limited in terms of flow rate.

Depending on the brand of water heater, you may need to install an expansion tank in order to meet the conditions for warranty coverage. It’s important for consumers to read the fine print of the warranty to see if an expansion tank is necessary. Even if an expansion tank isn’t required for the warranty, it’s usually mandated by building codes—although not for tankless water heaters.

The Waterloo, WI homeowners’ guide to water heater services

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

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