Combi Boiler vs Tankless Water Heater
Which is right for your Vancouver home?
Choosing between a combi boiler and a tankless water heater is one of the most common decisions Vancouver homeowners face when upgrading their heating and hot water system. While both are high-efficiency options, they serve different needs.
This guide covers the key differences to help you decide which system is right for your home.
Key Differences
- Combi Boiler: Provides both space heating AND hot water in one wall-hung unit — replaces your boiler and water heater
- Tankless Water Heater: Provides hot water only — requires a separate heating system (boiler or furnace)
- Combi Boiler: Ideal for homes replacing both a boiler and a tank water heater simultaneously
- Tankless: Best if you already have a functional heating system and only need to upgrade your hot water
- Combi Boiler: 95% AFUE efficiency for space heating
- Tankless Water Heater: Up to 97% UEF efficiency for hot water only
- Combi Boiler: Typically costs $7,500–$12,000 installed
- Tankless Water Heater: Typically costs $4,500–$8,000 installed
Combi Boiler Advantages
A combi boiler is the ultimate space-saving solution, combining your home's heating and hot water needs into a single wall-hung unit. This frees up valuable floor space in mechanical rooms, closets, and basements — especially important in Vancouver condos and townhouses.
Combi boilers are eligible for the highest FortisBC and CleanBC rebates because they replace both a heating system and a water heater with a single high-efficiency appliance.
Tankless Water Heater Advantages
Tankless water heaters are the more affordable option when you only need to upgrade your hot water system. They're simpler to install, have fewer connection points, and can be installed indoors or outdoors in many cases.
For homes with an existing functional boiler or furnace, a tankless water heater is the logical upgrade — you get endless hot water without the expense of replacing your entire heating system.
Our Recommendation
Choose a combi boiler if you're replacing an old boiler AND want to upgrade your hot water system. Choose a tankless water heater if you already have a working heating system and only need endless hot water.
Not sure which is right? Call us for a free consultation — we'll assess your current system, hot water needs, and home layout to recommend the best solution.
This is not a DIY repair
Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.
Call 778-909-5731Frequently Asked Questions
Talk to a Licensed Combi Boiler Specialist
Free, no-obligation quotes across Greater Vancouver. CombiBoiler.ca — A division of ROMA Heating Ltd..