Endless hot water. Installed with precision.

NH’s Local Tankless Hot Water Heater Pro.

More NH homeowners and business owners are choosing Rinnai for their tankless hot water needs. They’re also choosing a reliable and local Rinnai ACE dealer, GSMS! We’ve proudly been installing and servicing Rinnai tankless hot water heaters for 20+ years.

As your local Rinnai tankless hot water heater installer, you can rest assured our team of Service Specialists will assist you in installing a reliable system that will last you many years to come.

Learn more about our family business and how we have been proudly serving our New Hampshire neighbors for over 35+ years.

Schedule a Free Project Design Visit!

We offer a unique site visit that’s not about selling you equipment:

System Design Customized For Your Home

Absolutely No Sales Pressure

Solutions to Fit Almost Any Budget

How does a tankless water heater work?

With a tankless water heater, your Merrimack home’s cold water is heated only when you need it, and it stays hot until you’re done using it. This results in a limitless hot water supply and little to no wasted energy usage.

  • The heater detects hot water flow. Flame ignites and heats two heat exchangers

  • Water preheats as it passes through the secondary heat exchanger.

  • Water continues to heat to desired temperature as it passes through stainless steel primary heat exchanger.

  • Heated hot water exits the unit and travels through your home’s piping to the water fixture where it is needed.

  • Once the fixture using hot water is turned off, the flame in the unit turns off and water stops flowing. The process repeats!

Tankless is better than a tank in many ways.

Your Bedford or surrounding area hot water heater is the most important appliance in your home. Choosing tankless is the smart investment.

  • Waiting for hot water can be frustrating, costly, and wasteful. Recirculating technology eliminates the wait, so hot water is always at the ready.

  • Rated by a Uniform Energy Factor (UEF), tankless water heaters are a highly efficient hot water appliance and ENERGY STAR® certified units offer additional energy saving benefits.

  • Tankless water heaters are easier to repair than tanks, often eliminating the need to replace the unit. And many offer extended, comprehensive warranties.

  • Because your water is continuously heated as needed, you’ll never have to choose between taking a hot shower, doing a load of laundry, or running the dishwasher.

a promise you can trust, that’s us.

Our worry free promise that every Rinnai tankless water heater we install will come with an upfront & honest price, a team of Installation Specialists who are trained & certified, a commitment to providing the most advanced products & services possible, and that all our work we complete will last. It’s part of our mission to redefine home service.

Save money on your Rinnai tankless!

With NHSaves, there are excellent rebate programs available that you may qualify for to save $700. Reach out to our Service Specialists today to learn more!