Find top water heater services in Boise, ID

Darrin took the time to review our options for new HVAC system and water heater. Ultimate Heating is the only heating/ac company we have used and will continue to use. We have a complete new system and water heater going in next week.

Nick and Chris and Aiden did a great job. They showed up on time, and quickly got started with a complete system replacement. Our system was 15 years old and we trusted Ultimate to replace the furnace, air conditioner and hot water heater. It took only seven hours, and we were up and running. They took care of all the paperwork and city inspection notifications. Nick and his crew were professional and courteous. We are so happy with the new products.

Great responsive service. We have experienced an intermittent issue with our house heating system. The issue was not solvable at the time of repair; however, each step was explained and when the service was completed, we left off with a plan that I can execute to help zero in on the issue so that the next trip will solve the issue. I highly recommend this company. I have held a service contact for years and will continue to do so. 5/9/2023 Update! Evan and Gilbert came out today to perform the summer maintenance on the furnace, AC and to flush the hot water heater. I really like how thorough this company is when they perform their maintenance. During their testing they found that one of the parts on the AC was below spec (by a long shot) and recommended replacement. I took them up on their suggestion and likely avoided an outage in the near term. They wiped down the entire system both the furnace and hot water heater. They left everything better than they found it. If you need a maintenance package for you HVAC system these folks have a great offering, I highly recommend you buy it so that you don't have to worry about remembering to call and schedule; they will do that for you. Ask for Evan and Gilbert, they will hook you up.

I had all of my pumping replaced plus hot water heater. Pricy, but Ive spent money on plumbers that didnt solve problems for too many years. They were polite and hard working. Water issues cause major issues so Im glad I found a company I could trust

Phillip was great. Had yearly plumbing inspection and water heater flush. Thorough and explained everything in detail.

Knowledgeable, responsive, friendly, transparent and they show up on time. For the last 3+ years, we have had all positive HVAC experiences with this company, furnace, AC and plumbing/hit water heater. Jan 2026 update- another great plumbing experience with Conner. Our hot water heater went out. They visited same day, he quickly diagnosed the problem and explained an array of options. Very transparent and knowledgeable. Definitely recommend! Updating after a 65 point plumbing inspection with Brad. Big perk of being on the annual plan. Brad is clearly an expert plumber. He explained stuff, found issues, proposed potential solutions, was not pushy at all and the whole inspection was an info session. We were particularly interested in the hot water heater status because a house down the street just flooded from a HW tank blowing. It caused major unexpected damage. Brad showed me that my tank psi is too high, which is set based on city actions, and explained what I could do to lower the psi. Too much static pressure on the tank and fittings increases risk, which we don't want. Didn't know Ultimate offered this plumbing inspection but we're thrilled they do and will get one yearly.

Today, Preston drained my hot water heater and checked all plumbing in my home. HE was very professional, knowledgeable, personable and very thorough. I highly recommend this company for all your HVAC needs. All the technicians have been excellent. Keep up the great service!

Shawn was great...professional, friendly and helpful. Great job on installation of new water heater.

I got a hot water heater, a new furnace and a new AC unit all in one day. It was seamless. I really Respected and appreciated the professionalism.

Ken went above & beyond to repair my hot water heater. Extremely knowledgeable & explained what the issue was & resolved it. I will definitely use his service again.👍

Ryan was great. Very pleasant and took the time to give me some information about my hot water heater. He would be welcome anytime. Good job. AAA

Jake and Nickolas did a very neat installation of a water heater and the associated plumbing.

Diamond changed out our hot water heater to a different and better brand after our one year old one wouldn't light. Great service and great integrity!!

Thank you, Victor for an excellent job! I appreciate you changing the thermostat and draining the hot water heater! Thank you! Great job!

Leaking water heater—assessed and corrected—advised that it needs to be replaced eventually.

Put in new water heater

Our water heater has now been replaced by the experienced crew from Diamond. Good job guys!!

Water heater replacement.