GNK plumbing services

Top Pro

Licensed

Free service call

Select a service

Zip code

Type of heating system

Building height

Heating system problems

Responds in about 46 min

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About

I'm a Master Plumber. I provide Quality and Perfection. That is my number one goal. I do the job correctly and professionally. I'm not the cheapest, but I am skilled at what I do. Notes : We charge a $100 service fee, but if GNK Plumbing is hired for the job the fee will be waived. Monday to Saturday from 8.00 Am to 6.00 Pm

Overview

Current Top Pro

Hired 300 times

2 similar jobs done near you

Background checked

License verified

2 employees

21 years in business

Business hours

This pro hasn't listed their business hours.

Payment methods

This pro accepts payments via Cash, Check, and Credit card.

Top Pro status

Top Pros are among the highest-rated, most popular professionals on Thumbtack.

2025

2024

2023

Credentials

License verified

Plumber – Master

License state: MA

Background checked

Passed by Jean Kossaifi on Jan 4, 2023.

Services offered

Type of heating system

Heating system problems

No problem, just need maintenance

No heat

Not enough heat

Unusual noises from inside

Building height

Single-level

Two-story

Projects and media

Reviews

Customers rated this pro highly for work quality, professionalism, and responsiveness.

Excellent 4.9

194 reviews

5

96%

4

0%

3

0%

2

2%

1

2%

Read reviews that mention:

Gary P.

4 weeks ago

•

Hired on Thumbtack

I had a great experience with GNK Plumbing & Heating while working on my dishwasher replacement project. Jean was incredibly prompt, professional, and quick to respond to my request for help. To my surprise, he even showed up the very same day, which made the whole process much easier and less stressful. The work was done efficiently and with great attention to detail. I truly appreciate the fast service and excellent workmanship—thank you, Jean and the team at GNK Plumbing & Heating, for the great work!

Details: No, repair is not urgent • No, the building is not currently flooded • House

Plumbing Pipe Repair

Ria R.

Feb 5, 2026

•

Hired on Thumbtack

Jean was efficient and did an excellent job fixing our heating system. Will continue to use his company for any future heating projects. Thanks Jean!

Details: Boiler • Not enough heat • Two-story building • House

Heating System Repair or Maintenance

Milagros H.

Oct 29, 2025

•

Hired on Thumbtack

Details: Boiler • No heat • Two-story building • Condo or apartment

Heating System Repair or Maintenance

Marie S.

3 weeks ago

•

Hired on Thumbtack

Jean was very professional and did a great job at fixing my kitchen faucet. He knew exactly what was wrong and completed the job in a timely manner. He made sure to clean and remove any residue. He did not leave any mess behind. I will definitely rehire him.

Details: 1 sink • One handle controls both hot and cold water • 1 faucet • A month ago or longer

Sink or Faucet Repair

Jimmy S.

4 weeks ago

•

Hired on Thumbtack

Jean was great to work with. He was extremely responsive and able to come out to do the work quickly. He was efficient and easy to work with. He will absolutely be my first call whenever I need a plumber in the future.

Details: Other gas line installation • As recommended by professional • Stove or oven • I would like to discuss with the professional • House

Gas Line Installation

FAQs

What should the customer know about your pricing (e.g., discounts, fees)?
I offer multiple options with different proces and offer discounts depending on the job
What is your typical process for working with a new customer?
meet to customer assess the issue and discuss the options for the solution and make sure the customer is comfortable with our work
What education and/or training do you have that relates to your work?
I completed my journey license and master license. I have attended trainings around boilers and I complete yearly trainings to stay up to date with the latest procedures