WEIL-MCLAIN Ultra Boilers

Weil-McLain Ultra Boiler Overview

The Weil-McLain Ultra is an Energy Star rated condensing gas boiler with an AFUE between 92 and 93.3% for regular conditions, and 98% for conditions related to low temperatures. It is a two-stage induced draft boiler that has what Weil-Mclain call “integrated PhD (Precision Hydronic Data) Technology”, a system that “initiates efficient and ongoing hydronic heating”. The design of the Weil McLain Ultra gas boiler is CSA certified.

Weil-McLain has recalled Ultra Series 80,105,155 and 230 boilers manufactured after June 1, 2012 and prior to March 11, 2014. A cap on the boiler manifold can crack and release gas into the home, presenting a risk of fire or explosion. Consumers may contact Weil-McLain at 888-770-7139 for more information.

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Consumer Reviews of Weil-McLain Ultra


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #5 of 10 Weil-McLain Boiler
  • 25.81% of customers recommended

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Weil-McLain Ultra Boiler Reviews

Showing 16-20 of 31 reviews

"Many problems, little help"

1.0 rating
Very Unsatisfied

Ultra PHD 155 installed in 2002 (I have a box full of replaced parts). We had many problems starting from year one. Both main water pipes broke and leaked water, one year apart. Two blower fans, 3 circuit boards, igniter(s) this I can understand. There are many other parts replaced also. I have maintenance done regularly. Every year I have to have service work done on this system, still error codes continue and usage is disrupted. This was not an inexpensive boiler, it should last and be relatively problem free. I have put more money into fixing this P.O.S than it cost originally. I would not recommend it. My current service company does not recommend Weil-McLain. It's probably time to replace with a quality boiler/company, not Weil-McLain.

s. redinger

northern wisconsin

"Requires Manual Restarts"

1.0 rating
Very Unsatisfied

Ultra unreliable boiler, constantly requires manual restarts – sometimes several times a day! Cannot leave unattended in winter or in return I will find my house frozen.


Montreal, Canada

"Ultra 155"

1.0 rating
Very Unsatisfied

Installed in '05. Generally reliable, then this winter, within 2 weeks it was "red tagged" by the gas company due to a failed gasket. Then the blower died and left us without heat for 24 hours. When technology works, it's wonderful. When it doesn't, it really doesn't. Think very carefully before buying one of these.

F. Guillot

Burlington, VT

"Avoid Weil-McClain"

1.0 rating
Very Unsatisfied

We spent thousands of dollars on a new wm boiler and could not be any less happy with it. It shuts down and 'locks out' in the coldest weather and doesn't seem to be fixable. The repairman has been here countless times and even brought a WM area rep once and we still have problems. We were induced to buy by being told we could save up to 40% on our gas bill. After three heating seasons, we have had exactly a big fat zero reduction in our CF usage. Our old boiler wasn't even a problem, just the pump. This was a HUGE mistake. I hate this boiler. I would never, ever recommend buying a WM boiler unless I had a grudge against the person and wanted some really great revenge.


Xenia, OH

"Ultra is very unreliable"

1.0 rating
Very Unsatisfied

Installed the Weil-McLain 6 years ago and have never made it more that six months without it quitting. Suspect the electronics have caused most of the problems. However, no one has been able to repair it right. On line help and phone help from the company has been nonexistant. New mother board ordered, five to six hundred more dollars down the drain. If I had the funds, I would start up a national ad campaign against the company and see if that would get their attention.

Jim Christopherson

Hope, Idaho

Other Ultra Reviews

Comments about Weil-McLain gas boilers on HVAC-Talk message boards and heating contractor sites are generally positive:

  • In one hvac-talk.com forum, one service tech says that the circulator problem on one Weil McLain furnace is due to a bad motor. Heat is strong in every location except one. This heater is strong and persistent, but the circulator requires attention.
  • In another hvac-talk.com forum, another tech observes that the Weil McLain boiler works very well, especially through 3-way valves, and produces considerable heat. A couple of other forum guests agreed with this assessment.
  • In yet another hvac-talk.com forum, both techs and guests agree that Weil McLain provides good multiple relay distribution, providing that the circulator and thermostats are up to par.

Ultra Warranty

Weil McLain Ultra boilers come with a 5-year parts and labor warranty. The unit must be registered within 30 days of installation to qualify for the warranty.

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