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Onze Southern Connecticut Plumbing & Heating is a Milford plumbing and heating company with 128 Google ratings averaging 5 stars. The company says it has been in business 37 years. A recent customer describes a heating and tankless system replacement in which Jason and his team arrived every day until the project was completed and cleaned up their work area. A recent customer says Jason answered a call on a Saturday and had someone out within the hour. A recent customer with a second-floor shower leak says Dave, Jason's plumber, immediately diagnosed the issue after a first plumbing company had not diagnosed it correctly. A recent West Haven customer says the service tech Ryan arrived early to replace a kitchen faucet and strainer, and notes that the $105 call-out fee is deducted from the final cost of the work. A 2026 customer said the team was punctual and tidy throughout a boiler installation. A 2025 customer said the company finished an oil to gas conversion in one day. A 2025 customer said a building inspector examined a job that included a new boiler, extensive plumbing for a propane conversion and pool plumbing. A 2025 customer said the company came out within a day of the call and identified holes in old copper piping as the cause of a bathroom leak; that customer wrote that they weren't cheap. In a 2010 review, a customer said Mr. Onze had all the rooms in the house measured and ordered a gas hot water heat unit with fewer BTUs than the old one. In an April 2025 r/connecticut Reddit comment, a poster suggested trying Onze plumbing and called it a reputable company they know well.
“Try Blue frog plumbing and Onze plumbing. Both reputable companies that I know well”
Jason is an absolute gem! We received quotes from multiple companies, but he stood out with the most competitive price and the highest quality product. He provided us with a comprehensive explanation of our options and was the only person who was genuinely honest and transparent. Moreover, once he and his team commenced the heating and tankless system replacement, they were punctual and arrived every day until the project was completed. They cleaned up their work area and always arrived exactly when they said they would. We highly recommend Jason and his team to anyone in need of reliable and professional heating and tankless system installation services.
Jason answered my call on a Saturday and had someone out within the hour to help me. Communication was great and very up front about costs. Will be using them again!
We did a total kitchen remodel with the installation of 2 sinks, 2 dishwashers, a gas range, and refrigerator. We also needed a toilet installed and repair on a water heater. Their work was tmely and efficient, and their workers were pleasant, enjoyable people to have in the house. Thank you, Onze!
These guys were totally professional and fast. Jason was really good at communication and planning and did exactly what he said he would. He helped us out and went above and beyond to get a leak fixed in kind of an emergency. They are my first call next time.
I had a leak and n a second floor shower. The first plumbing company did not correctly diagnose the problem and quoted a very high rate to fix. I called Jason and his company was very responsive. Dave, his plumber, came and immediately diagnosed the issue. He was professional and did an excellent job. I would highly recommend Onze Plumbing.
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1 change recorded — last scanned Oct 13, 2026.
Typical Connecticut range for this kind of work, from regional averages — not a quote from Onze Southern Connecticut Plumbing & Heating. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,700 – $10,700
Typical HVAC project around $7,700
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