Combi Boilers & Water Heaters: Energy-Efficient Hot Water Solutions

Endless hot water on demand, designed to save energy and space.

Expert HVAC Solutions for Your Home

At Marathon Service Company, we understand that your home’s comfort is a top priority. Whether you need reliable heat during the winter or consistent hot water year-round, our experienced team delivers dependable, energy-efficient solutions tailored to your needs.

With over 30 years of experience, we specialize in residential heating systems that maximize comfort while reducing energy costs. From system installation to long-term maintenance, our certified technicians work with you to create a comfortable, efficient, and reliable home environment.

Rinnai Hot Water Heaters

With a Rinnai tankless water heater, you’ll never have to choose between taking a piping hot shower, doing a load of laundry, or running the dishwasher. Hot water is always available.

Endless hot water supply
Energy-efficient operation
Space-saving design
Longer lifespan than traditional heaters
Lower energy bills
Precise temperature control

How It Works

Regardless of whether your existing plumbing system has a dedicated return line, you can enjoy faster hot water through recirculation. Rinnai offers the option for you to either set your recirculation schedules according to high-demand times or for you to utilize on-demand recirculation through the use of push buttons and motion sensors.

On-Demand Heating

Water is heated instantly as it flows through the unit, eliminating the need for a storage tank.

Smart Recirculation

Advanced recirculation systems deliver hot water instantly to your faucets and showers.

Energy Efficient

Only heats water when needed, reducing energy consumption by up to 40%.

Space Saving

Compact wall-mounted design frees up valuable space in your home.

Combi Boilers

A combi (combination) boiler is a high-efficiency system designed to provide both space heating and domestic hot water from a single, compact unit. By combining these two functions, combi boilers eliminate the need for separate water heaters, saving valuable space and reducing overall installation costs. Combi boilers are an excellent choice for homeowners looking for an energy-efficient, space-saving solution without sacrificing comfort or performance.

How Does a Combi Boiler Work?

A combi boiler operates by delivering space heating and on-demand hot water from one integrated system. During heating mode, water circulates through the boiler’s heat exchanger to warm your home. When a hot water tap is opened, the system automatically diverts energy to produce domestic hot water instantly.

Once the hot water demand ends, the system seamlessly switches back to space heating. This efficient process ensures consistent comfort while minimizing energy waste.

Ready for Year-Round Comfort?

Schedule your HVAC service today and experience the Marathon difference. We’re available 24/7 for all your heating and cooling needs.

410-543-2962

25600 Ocean Gtwy, Mardela Springs, MD 21837