Heat and Hot Water From One Unit

Combi boiler installation and service for homes and buildings in Bozeman, Montana.

If you are working with limited space in your mechanical room or planning a new build in Bozeman and Livingston, a combination boiler gives you both home heating and on-demand domestic hot water without needing a separate storage tank. The unit heats water as you use it, which means you do not run out during back-to-back showers or while running the dishwasher. This setup is common in modern homes where efficiency and square footage both matter.


Granite Peak Mechanical Services installs and services combi boiler systems throughout Bozeman and nearby areas. The team handles professional sizing to match your home's heating load and hot water demand, then connects the unit to your hydronic heating zones and domestic water lines. Combi boilers are well-suited for Montana climates that require reliable performance during long winters and rapid temperature swings, and they reduce your equipment footprint while improving energy efficiency compared to older setups with separate tanks.


To discuss combi boiler options for your home or building in Bozeman or Livingston, contact the team to review your layout and heating needs.

How a Combi Boiler Changes Your Setup

A combi boiler installation in Bozeman involves mounting the unit on a wall in your mechanical room or utility space, then connecting it to your home's gas supply, water lines, and heating zones. The installer routes a cold water line into the unit and a hot water line out to your fixtures, eliminating the need for a storage tank. You will also see updated controls that let you adjust both your home's heating temperature and your domestic hot water output from a single interface.


Once the system is running, you will notice that hot water arrives quickly at your faucets and showers without waiting for a tank to refill, and your home stays warm without the space or complexity of a traditional boiler and water heater setup. The combi unit switches between heating your home and heating your domestic water automatically, so you do not have to manage two separate systems or worry about tank leaks or sediment buildup over time.


The installation includes pressure testing, leak checks, and a full system startup to confirm that both heating and hot water modes operate correctly. Proper sizing is critical, as undersized units may struggle to keep up with simultaneous demand, while oversized equipment can cycle inefficiently. The team evaluates your home's square footage, insulation, and typical water usage to recommend the right model for long-term reliability.

What Homeowners Usually Want to Know

Before installing a combi boiler, homeowners in Bozeman often ask about performance during peak demand, maintenance needs, and how the system compares to their current setup.

What happens if I use hot water while the heat is running?
The combi boiler prioritizes domestic hot water, so when you turn on a faucet or shower, the unit temporarily stops heating your home and redirects energy to the water line. Most homes do not notice a temperature drop during short hot water use.
How much space does a combi boiler save?
You eliminate the need for a separate water heater and storage tank, which typically frees up several square feet in your mechanical room or basement. The combi unit itself is wall-mounted and about the size of a small cabinet.
Why are combi boilers popular in new construction?
They reduce plumbing complexity, lower installation costs, and improve energy efficiency, all of which matter in modern builds where space and performance standards are tightly managed. Builders in Bozeman often choose combi systems for homes with open floor plans and limited utility space.
What kind of maintenance does a combi boiler need?
Annual service includes checking the heat exchanger, testing safety controls, inspecting water pressure, and flushing the system if sediment or scale has built up. This keeps the unit running efficiently and prevents breakdowns during the heating season.
When should I consider a combi boiler over a traditional setup?
If you want to reduce equipment footprint, avoid the maintenance and space requirements of a storage tank, and still get reliable heat and hot water, a combi boiler is worth evaluating. It works especially well in homes with moderate hot water demand and modern hydronic heating systems.

Granite Peak Mechanical Services installs and services combi boiler systems for homeowners throughout Bozeman and the surrounding area. If you are building, remodeling, or replacing an aging system, reach out to discuss sizing, equipment options, and what a combi setup would look like in your home.