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

Avatar for American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,689
)
Solar Water Heater System - InstallTankless Water Heater - InstallTankless Water Heater - Install - For Business+6 more

Serving Plains, MT and surrounding areas

In business since 1971

Credit card accepted

"We pay yearly but we have this is included with our rental property. They are pretty good on most things. We had a hot water heater replaced and they did an excellent job on that. They are very quick on their response. They dont come out here. It is all done on the internet.  I just like the idea that one time service charge is so much better than trying to hiring someone to come in. It is more about convenience. It pays for itself."
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+2

Recommended by65%of homeowners
Avatar for Planetary Systems, Inc.
Planetary Systems, Inc.
0.0(
3
)
Solar Water Heater System - Install

Serving Plains, MT and surrounding areas

In business since 1994

Free estimates

Credit card accepted

Planetary Systems has been designing and installing renewable energy systems since 1994, and has over 1600 operational systems from .5kw to 22kw, worldwide. We have always been and remain committed to tested and reliable, yet cutting edge technologies to advance local power generation capabilities. We firmly believe all electrical power should be locally generated and using as much energy as practically feasible from wind, solar, hydro-electric and other renewable sources. \n Planetary Systems offers our own battery technology, integrated power solutions, and the best available products available in the world marketplace. \n \nOur offerings are based on value-added products, not bargain basement prices, and include complete testing, design and integration of systems plus expert technical assistance.

 Grid-tie sell back power system
 Gird-tie sell-back power system
 Off-grid power system
 Grid-connected back power
 Pole mounted solar arrays

+7

Recommended by100%of homeowners
Avatar for RJ HVAC
RJ HVAC
New to Angi
Tankless Water Heater - RepairTankless Water Heater - Repair - For BusinessWater Heater - Repair or Service+1 more

Serving Plains, MT and surrounding areas

In business since 2025

Emergency services offered

Small jobs welcome

Hi my Name is Reeve. I provide honest and accurate prices for service and repairs of residential and commercial hvac systems. Everything from tune ups to full system replacements. I currently hold my EPA universal license and Montana state boilers license. I also have many certifications on different types of units and systems, with endless hours of factory training. I?ve worked in both the commercial and residential space over my 9 years of experience. I value myself on honest and up front diagnostics and repairs. Located in Kalispell but will service from Missoula to eureka.

Rtu replacement
Mini split maintenance
Avatar for TCH Builders & Remodeling
TCH Builders & Remodeling
4.0(
2
)
Solar Water Heater System - InstallTankless Water Heater - InstallTankless Water Heater - Install - For Business+6 more

Serving Plains, MT and surrounding areas

In business since 1999

Emergency services offered

Credit card accepted

If you dream it, we can build it. What's the biggest difference between us and them? We build to last! We offer a full line of Green and Energy Star Certified products, backed by our labor and manufacturer's lifetime transferable warranties. Credit Cards Welcome Financing Available OAC.

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

You should replace your gas water heater when it’s reached the end of its lifespan, which is a maximum of 12 years in most cases. If your unit is over a decade old and showing signs of inefficiency, leaks, or frequent malfunctions, it may be time to replace your water heater. Research how to best maintain your gas water heater to help extend its lifespan.

The time it takes to install or replace a water heater depends on the type of heater and the complexity of the job. A professional can typically replace a standard tank-style water heater in one to three hours. However, if the work area is tight, such as a small closet or crawl space, the job could take four to five hours. Replacing an existing tankless unit takes about two to three hours, while upgrading from a tank-style to a tankless water heater is more complex and can take four to six hours. The project will take longer if you are switching fuel sources, such as installing a gas heater which can add about an hour to the timeline, or if the unit needs to be relocated.

Electric water heaters typically last 10 to 20 years, though proper maintenance can extend their lifespan. If your unit is over a decade old and showing signs of inefficiency—such as higher energy bills, frequent repairs, or leaks—replacement is a smart investment. Tankless models last over 20 years, which can make them a longer-lasting alternative to traditional tank water heaters.

A thermocouple is a pretty simple device. It simply tells the control valve if heat is present. Most water heaters can use a universal thermocouple, provided it's the correct length. Getting one that's long enough for your appliance is crucial for success. However, some water heater models require model-specific thermocouples, which is why it's essential to take your existing one to the store to find the right match.

The average water heater holds between 40 and 60 gallons, but the exact amount of water that comes out during draining will depend on your unit’s capacity. The amount of time it takes to drain a water heater averages from 10 to 30 minutes.

The Plains, MT homeowners’ guide to water heater services

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