Best boiler installation pros near Glendale, CO

"Don was excellent. He performed a very thorough inspection of my system and clearly explained all his findings. My furnace is 20 years old, and despite finding many smaller issues he was not pushy about replacing the entire thing. He just gave an honest assessment of the condition. Don correctly found the issue with the blower (bad controller board) and fixed the cause of the failure (plugged drain pipe, causing water damage). After replacing the board the furnace is back up and running. I'll be giving them a call when it is time to replace the furnace."

"I contacted the home office for an appointment on Monday this week, and they got me on the schedule for the upcoming Friday morning. The email and text response about the appointment that i set was excellent. The technician notified me he was on the way and promptly arrived at 8am. His name is Greg, and he is very knowledgeable about boilers and his craft. He was able to correctly identify our immediate trouble and let me know he could have the unit back up and running the same day. He also let me know about other details that should be upgraded. So, we are very happy that Greg came to our home and checked out the boiler. We will be very happy to have them back in the future."

"I called to get a third estimate on replacing my residential boiler. I was looking at replacing it because other contractors had advised that the cost of repairs was too high; repairing a 20 ye old boiler didn’t make economic sense. Gilles sent Justin over the next day, so very quick service. Justin gave me a ballpark price to replace it, which was more in line with what I thought was fair. He also gave me a very fair price to repair it — about a third of what the other contractors quoted. A good chunk money, but a much better option right now. Comparing what the three contractors told me, I’m confident that Justin had it all coveted. He then allowed me to video him, explaining what he did and what I should expect and look out for. He also sold me on their annual maintenance plan, which is a bargain because it includes evaporative cooler startup and shut down."

"We hired Plumbing Tree to fix an improperly installed flange by the builders of the home. The quote from them was a little high, but calling around it was similar to other plumbers. The plumber agreed that the flange was not installed correctly (rotated 90 degrees) and the bolts were stripped. The first appointment was missed, I got a text message an hour before he was supposed to show up saying that he could no longer make it due to the current job going long. The next day, I got a text right before our installation time window that he would be late. The plumbers were professional and seemed to be doing a good job. They were thorough and cleaned up after themselves well. The sink wasn't caulked as we want to touch up the paint first and he was very kind to actually leave us a tube of caulk and a rag for the job. After the job is done, there are two things that are bothering me. The first was that the flange (double flange to increase the height) was installed in the same 90 degree rotation as the initial one, so honestly I am a bit confused on this (the slots where you are supposed to put the bolts in every single manual on toilets are at the front and back instead of the side and the top and bottom slots were used on the sides instead). The toilet itself is slanted, not perpendicular from the wall (not by a huge amount, but it is noticeable). Since it is caulked down on our new floors, it is going to be permanently off square. Over all, I think they had a good attitude and the job that was quoted for 1 1/2 hours took 2 hours, so not bad there. We are saying we would not hire again due to the rotation of the flange, the inconvenience of rescheduling twice and that the toilet was installed a bit crooked."

"New boiler installation was completed in a professional and timely manner with great attention to the details. The system looks good and works beautifully!"

"They were very quick to provide an estimate and timely turn time on install. Everything was done on time and as promised. Highly recommend."

"Jim did a great job installing my water heater. He also repaired a washer leak and water connectors. I would highly recommend him. He was fair and reasonable, high ethical standards. I certainly will call him again if I have a problem. Thank you Jim......"

"So far as I can tell, the quality of the products and the quality of their installation was fine. The furnace includes PVC pipe venting both to bring combusting air into the furnace from the outdoors and taking exhaust gases outdoors through another PVC pipe through a concentric vent in the outside wall. This process is designed to prevent any exhaust gases in the basement or any bad negative air pressure in the basement. The furnace is an energy star with 95 percent efficiency. The only negative aspect of all this was Controlling Systems' behavior relating to scheduling as described in the section above."

"Installed new boiler and replaced all the plumbing in our basement (our house is 127 years old). They did a good job and worked hard to get our boiler replaced when the old one gave up the ghost in the winter. Also did a good job replacing all our plumbing in the basement and crawlspace in 2 working days. Kind of a strange name but don't worry, they are a really good plumbing and heating company and offer a 0% interest loan to pay for the bill."

Mammoth Plumbing, Heating & Air Conditioning is committed to delivering reliable, high-quality service without the inflated price tag. With years of hands-on industry experience, we’ve built our reputation on honest work, clear communication, and doing the job right the first time.\nWe specialize in a full range of residential and light commercial services, including plumbing repairs, water heater installations (tank and tankless), drain cleaning, gas line repairs, furnace and AC installation, maintenance, and more. Whether it’s a small fix or a major system upgrade, our team approaches every job with professionalism and attention to detail.\nAt Mammoth, we believe top-tier service shouldn’t come with top-tier pricing. That’s why we offer transparent, flat-rate pricing and solutions designed to fit your needs and budget. Our goal is simple: keep your home comfortable, safe, and running smoothly year-round.\n