Boiler calculators & tools
Free, instant tools to size your boiler, estimate cost and savings, compare financing, and get a personalized recommendation — no signup required.
Boiler Size Calculator
Find the right BTU output for your home based on size, climate, and insulation.
Open tool →Boiler Capacity Calculator
Calculate heating load and hot-water demand, with matching boiler models.
Open tool →Boiler Cost Calculator
Estimate installed cost after rebates by boiler type, brand tier, and complexity.
Open tool →Monthly Payment Calculator
See affordable monthly payments across every financing plan.
Open tool →Heating Cost Calculator
Estimate annual fuel savings from upgrading to a high-efficiency boiler.
Open tool →Boiler Lifespan Calculator
Check how much life your current boiler has left and when to replace it.
Open tool →Combi Boiler Selector
Match a combi boiler to your bathrooms and hot-water demand.
Open tool →Boiler Upgrade Advisor
Answer 4 questions for a personalized boiler recommendation.
Open tool →Compare Boilers
Put any boilers side by side — specs, warranty, efficiency, and price.
Open tool →Compare boilers and get matched with approved installers
Free quotes from up to 3 verified local boiler specialists. No obligation.