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One customer has kept calling JDias for four years: a new furnace, a central air fix, new pumps on the basement sump system, according to an August 2026 Google review. Customers also know the business as JAD Plumbing, and several reviews name Jon Dias as the plumber. The company describes itself as a plumbing and mechanical shop serving homes and businesses across the greater Tyngsboro area, says it has been in business 22 years, lists Tyngsboro and Merrimack as its service area, and offers free estimates. Its Google page shows 5 stars from 8 ratings. The biggest job in the reviews comes from a February 2022 Google review by the buyer of a triple-decker: Jon Dias replaced leaky copper pipes with PEX, replaced drain pipes and added washer and dryer hookups on all three floors, renovated the third-floor bathroom, upgraded to a tankless water heater and installed central air on the first floor. That customer called the pricing very affordable and described Jon as a second-generation plumber. Other reviews from early 2022 describe a bathroom upgrade, a water heater replacement with a pressure problem sorted out, and a quick response to a call with a fair price. In a February 2026 review, a general contractor said they have used JAD Plumbing on new construction and remodels and called him honest, fair and easy to work with.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from JDias plumbing and mechanical LLC. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$290 – $710
Typical plumbing job around $500
I have been using JDias service for the last 4 years. JDias have been doing a lot of things at my house. New furnace , fix central ac , Change the pumps on the sump pump system in the basement. I am very happy with his work and recommend him. Thank you JDias
Great company! Very professional
I am a general contractor and have used JAD plumbing from new construction to remodels. He is honest, fair and very easy to work with.
I recently purchased a triple decker. I was fearful of all the projects that laid ahead of me. With a simple call to JAD Plumbing Heating and Cooling, Jon Dias was able to tackle all of my plumbing and heating repairs and renovations. All leaky copper pipes was replaced with pex. Drain pipes was replaced for all three floors. Washer and dryer hook ups for all three floors. Complete renovation of the 3rd floor bathroom. Upgraded water tank to a high efficient tankless water heater. Install central air (heating and cooling) on the first floor. Communication was excellent, responsive to all my phone calls and text messages. Pricing was very affordable. I felt I had an absolute bargain considering the level of superb workmanship and professionalism received. Jon’s a 2nd generation plumber. His work speaks volume! Looking forward, I would never have to worry about another plumbing or heating projects. Jon can handle any small tasks and major projects. I strongly recommended Jon’s expertise for all your plumbing and heating needs!
These guys provided Great work and outstanding service. Could not recommend with more enthusiasm. Super professional, friendly, knowledgeable, and they make sure the job is done perfectly. In a field where trust and reliability matter so much, these guys delivered big time. Jon is my hero. I will be using them for every single job around the house that i possible can. Thanks again Jon!
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2 changes recorded — last scanned Sep 22, 2026.
Transparent diagnostics5.0
Quoted price holds5.0
Midnight and weekend help5.0
Broad plumbing and HVAC range5.0
Rapid response5.0
Repeat, years-long customers5.0
3.6
Statewide heat pump recognition3.3
63 permitted projects reported2.8
5.0