How to Choose the Right Combi Boiler
Your complete guide to selecting the perfect combination boiler for your Vancouver home
Assess Your Home Size & Heating Needs
The size of your home directly determines the heating output (measured in BTUs) you need from your combi boiler.
| Home Size | Bedrooms | Radiators | Recommended Output |
|---|---|---|---|
| Under 1,000 sq ft | 1-2 | Up to 10 | 24-28 kW |
| 1,000 - 1,800 sq ft | 2-3 | 10-15 | 28-35 kW |
| 1,800 - 2,500 sq ft | 3-4 | 15-20 | 35-40 kW |
| 2,500+ sq ft | 4+ | 20+ | 40+ kW or system boiler |
Pro Tip: Vancouver's mild climate means you may need less heating capacity than homes in colder regions. Our experts can calculate your exact needs during a free assessment.
Calculate Your Hot Water Demand
Count your bathrooms and hot water outlets to determine the flow rate (litres per minute) you need.
9-12 L/min
24-28 kW combi boiler
12-15 L/min
28-35 kW combi boiler
15+ L/min
35-40 kW or system boiler
Important: If multiple showers run simultaneously, you may need a higher output combi boiler or consider a system boiler with a storage tank. We can assess your specific needs.
Understand Efficiency Ratings
What is AFUE?
AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a boiler converts fuel to heat. Higher percentages mean more savings.
95-98% AFUE (High Efficiency)
Maximum savings, eligible for rebates
90-94% AFUE (Standard)
Good efficiency, moderate cost
Below 90% AFUE
Outdated - consider replacement
Annual Savings Example
Upgrading from 80% to 96% AFUE on a $1,500/year gas bill:
Plus potential BC rebates available!
Compare Top Combi Boiler Brands
We install and service all major brands. Here's how they compare:
Navien
View ModelsPros
Best-in-class efficiency, excellent warranty, quiet operation
Cons
Premium pricing
Best For
Maximum efficiency seekers
Rinnai
View ModelsPros
Proven reliability, great parts availability, tankless expertise
Cons
Higher maintenance costs
Best For
Reliability-focused buyers
Bosch
View ModelsPros
German engineering, compact design, great value
Cons
Less common in Canada
Best For
Value-conscious buyers
Viessmann
View ModelsPros
Premium quality, ultra-quiet, longest lifespan
Cons
Highest cost
Best For
Premium buyers
Lennox
View ModelsPros
Trusted HVAC brand, great dealer network, solid warranty
Cons
Mid-range efficiency
Best For
Brand loyalists
Key Features to Look For
Adjusts flame to match demand - saves energy and provides consistent comfort
Essential for Vancouver's occasional cold snaps - prevents pipe freezing
Integrated circulation pump reduces installation complexity and cost
Captures extra heat from exhaust gases for higher efficiency
Look for 10+ year heat exchanger warranty and 5+ years parts
Important for Vancouver's hard water areas to extend lifespan
Need Help Choosing the Right Combi Boiler?
Our certified experts will assess your home and recommend the perfect combi boiler for your needs and budget - completely free.