Wait less, waste less and save more.
Between the space savings, greater eco-efficiency and endless supply of hot water that comes with tankless technology, there is no comparison. Enjoy faster hot water with Rinnai’s ThermaCirc360 recirculation technology solution. Add in long term cost savings, and it means more comfort for less money.

Rinnai + Denommee Plumbing: Total confidence
Get endless on-demand hot water, space savings, eco-efficiency and peace of mind from the world’s most reliable tankless gas water heater brand. Whether you need a residential water heater or commercial water heater, you can trust the #1 selling gas tankless water heating brand in North America. Enjoy the total confidence that comes with 30 years of innovation, support and integrity knowing a Rinnai® tankless water heater will meet your needs. It’s time to expect more because you deserve it. Denommee Plumbing, Heating & Cooling: Four Generations of Experience.
We have been providing legendary plumbing heating system installation and service to our valued customers across Massachusetts and southern New Hampshire for well over twenty years. As your local Rinnai VIP contractor, we are your expert resource for installation and service of these top-in-class tankless water heaters.

Save up to $100 Dealer discounts and $800 in State Incentives
For a limited time, you can save an immediate $100 in dealer discounts on a complete Rinnai Tankless Water Heater from Denommee Plumbing, Heating & Cooling that also qualifies for up to $800 in additional National Grid Massachusetts state energy rebates. Our office support team members are experts in maximizing rebate and incentives while making the process simple and easy for our customers. Call and visit now for details and to schedule a free in-home consultation 978-649-8886 or request service and book appointments right here on our website. We have the licensed experts and technicians, along with the right products, equipment and solutions to serve all your home or business’s plumbing, heating and cooling needs. We service nearly all existing types and brands of plumbing and HVAC systems. Our service is legendary—we have decades of experience getting the job done, for the right price.

Endless Hot Water on Demand
Enjoy all the hot water you want, when you want it. With a Rinnai tankless, you’ll put an end to rationing water. Never choose between taking a shower or doing dishes. When demand is high, a traditional tank water heater can run out and leave you or your family in the cold. A tankless gas water heater heats water as it goes through the pipes, giving you an endless hot water supply.

Save Money, Energy and Space
Rinnai tankless water heaters are more energy efficient with lower CO2 emissions compared to tank water heaters. A tank water heater may heat and reheat water even when you’re not at home-wasting money and energy. Tankless only heat when you need it. Gallon for gallon you will spend less heating your hot water. Your water heater need not be a behemoth taking up valuable living space. A Rinnai tankless is only the size of a small suitcase and can be mounted in an attic, basement, garage or even outside, meaning more space for living and less for heating hot water.

Reliability for the Long Haul
Rinnai tankless water heaters are designed, engineered and built for the long haul. They can last up to two times as long as a traditional tank water heater. When purchased from a Rinnai authorized dealer like Denommee Plumbing, Heating and Cooling, your Rinnai comes with a generous warranty and the backing of a company that knows how to install and maintain your tankless to ensure you enjoy maximum performance and longevity from your water heater.  

Denommee Plumbing, Heating & Cooling: Installing working works of art
Denommee Plumbing, Heating & Cooling, Inc. is renowned for quality craftsmanship in plumbing and HVAC system installations. Attention to detail, along with clean and careful work are hallmarks of our team of professional installers and service technicians.