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This system is designed to replace traditional storage tank water heaters while using the existing vent shaft.
Another tankless conversion completed in San Francisco! Every project has its challenges, but we always find a way to get the job done right
If you prefer to continue using gas, converting to a tankless water heater is a great option.
Installation
Another hot water upgrade! Hybrid heat pump water heater conversion in Castro Valley--bringing modern comfort home.
Smarter hot water starts here! A 65-gallon hybrid heat pump water heater conversion in Berkeley by Just In Time Water Heaters.
25 year old 40 gallon upgraded to 75 gallon with recirculating pump and platform rebuild.
Upgraded to a Navien Non-Condensing
Tankless conversion in Livermore! 
  Upgraded for hot water on demand and a space-saving design. Ready to make the switch?
Taking hot water to new heights! Rooftop tankless water heater upgrade in San Francisco by Just In Time Water Heaters.
Just in Time Water Heaters Water Heater Service

At Just In Time Water Heaters, we combine specialized expertise with personal service. As an owner-operated business, we take pride in providing honest recommendations, clear pricing, and quality workmanship—whether you need a repair, replacement, or an upgrade to a tankless or hybrid heat pump water heater. We understand that losing hot water can disrupt your day, so we offer same-day service when available and work efficiently to get your hot water running again. We take the time to explain your options, answer your questions, and recommend a solution that fits your needs without pushing an unnecessary replacement. Serving the San Francisco Bay Area and Tri-Valley, we’ve earned our customers’ trust through responsive communication, fair prices, and professional installations. We treat your home with care and stand behind the work we do.

Website: justintimewaterheaters.com

Phone: (925) 440-9226

Cross Streets: Near the intersection of Willowhaven Way and Stonegate Way

Response 7 secs. Response rate 100%

Open now

  • Sun Open 24 Hours

4932 Willowhaven Way Antioch, CA 94531 ·2308.41 mi

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Reviews

yelp
5.0 132 reviews
5 star
124 4 star
3 3 star
0 2 star
1 1 star
4
Mahmoud I. 10/23/26

He so nice guy and no expensive too I recommend him for all customers He was so professional and professional

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Andy R. 10/30/26

There is a reason Doniel gets 5 start reviews all the time! 5 star work is where it is at! Great communicatins, fast service, easy going, clear pricing and Doniel even prepped me incase extra...

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Andy S. 10/22/26

Quick service and response. Doniel was able to come by and look over my old water heater and said it was on its last legs. He came over with a new replacement heater and even pulled him away...

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Paul A. 10/31/26

The technician arrived right on time and did an excellent job installing my water heater. He was efficient, polite, and respectful of my home, and he cleaned everything up before leaving. The...

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Maryam M. 10/31/26

I had a great experience working with Just in time water heaters. He was very responsive, took the time to answer all of my questions. He was professional, honest, and, most importantly, very fair...

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