HTO Plumbing & Radiant
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HTO Plumbing & Radiant
HTO PLUMBING & RADIANT specializes in the design and installation of complete plumbing and radiant heat packages for custom homes and commercial projects. We handle new construction as well as re-models. Our emphasis is on clean, high-quality craftsmanship. We serve San Francisco, Oakland, and the entire Bay Area.

From the installation of your kitchen and bathroom fixtures to the repair of your sewer and gas lines, HTO Plumbing & Radiant can serve all your plumbing needs. We design new plumbing systems, remodel existing systems and install boilers, tankless and regular water heaters. HTO Plumbing & Radiant can design and build a variety of high-efficiency hydronic heating systems for your home or commercial building.We work with under-floor systems and radiators.
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TJ Modelski, Owner, has been installing plumbing and hydronic heating systems since 1996. He has a Bachelors of Science in Architecture and Design from Lawrence Tech University in Southfield, MI. He became a Journeyman Plumber in the State of Michigan in 2000 and in the State of California in 2003.
HTO Plumbing & Radiant installs complete plumbing systems for custom homes and small commercial projects. This includes: water supply, drains and gas lines. We are trained in green plumbing systems including solar water heating and tankless water heaters.
Reviews (8)
Alfio L.
Alfio L.
Oct 21, 2019
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I was introduced to TJ through a trusted friend and neighbor, and hired TJ to install a new boiler for us. He put in a state of the art system for us back in June of '19. The results of his work, his professionalism, and his knowledge of boilers and boiler systems is far beyond any of the other folks I talked to. He knows much more than just installing boilers - he knows how to design the system in a way which will last a long time (by including the appropriate filters, maintenance points, and setting the appropriate water chemistry). He also knows the details of sizing pumps, vents, and
Brandon B.
Brandon B.
Jan 03, 2018
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Can't say enough good things about these guys. Moved into our house this summer and discovered the radiant system didn't work. After two months of the sellers' contractor failing to fix it, we reached out to TJ. He responded immediately, diagnosed the complex problem, and had it fixed in about a day-and-a-half. He didn't try to sell us on a new boiler like another contractor did (for $10k), he just got the system working. Call them, you won't regret it.
Dave C.
Dave C.
Mar 28, 2017
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We had to replace a boiler that was over 50 years old for our radiant heat system.
TJ's estimate was very fair and we liked his demeanor and confidence.
TJ and his brother Chris did a fantastic job. Highly knowledgeable, professional and friendly. The job took about a week to complete and they were punctual and tidy with their clean-up at the end of each day. We are pleased with the end result and the boiler room has never looked better. Very neat work! Thank you!
Bruno R.
Bruno R.
Apr 28, 2015
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TJ is great. No BS, good quality work throughout, very detail oriented and in budget. He installed for us a 7 zone hydronic radiant system and a whole house water filter, plus a couple of more smaller jobs. I am very happy with the result, the interaction and TJ professionalism. I have learnt the hard way not qualities easy to find nowadays.
Steve S.
Steve S.
Feb 15, 2015
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HTO did an excellent job of installing a multi-temperature radiant and domestic hot water system. We had installed a dual temperature radiator and radiant floor system with DHW about a dozen years ago and it never worked right. TJ proposed a new boiler, controls, thermostat and control plumbing configuration. His bid was reasonable compared to others and after checking references and reviewing options with him, we selected him and he did a a great job of installing the system. it all works great now - so much better system. We felt very comfortable with him and his expertise/skill.
Mizcat C.
Mizcat C.
Nov 01, 2013
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Our fairly new (installed 2009) radiant heat system stopped working a month ago. We had another company come out to do an initial assessment (failed boiler pump, likely the cause of the system not being drained/restarted correctly after a leak detection 2 years ago) but wanted a second opinion. TJ came within 2 days of the initial call (would have been less than a day if our schedules had allowed it) and confirmed the diagnosis within 10 minutes (vs. 2 hours w/the other company), picked up a new pump and had it installed within the hour at a fraction of the cost estimated by the first company.
Jennifer Y.
Jennifer Y.
Jan 11, 2013
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We had a major gas leak and I looked on Yelp for someone to help us fix it. TJ was the nicest and the cheapest quote we got. He came back multiple times to make sure it was fixed and he was really great. We had other leaks which we had TJ fix as well. Overall, very reliable, friendly and got the job done.
Jamie T.
Jamie T.
Sep 27, 2010
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TJ is excellent. He 1st came by to look at my waterheater in a 6 unit TIC. The pilot was out so he came by lit it and didn't even charge us. He said that I should keep an eye on it and let him know if it went back out. It did, so he gave me a quote to replace it. I shopped it around and he was the friendliest and had the best price (by $500). I would recommend TJ for any plumbing problem I have.