Free Heating Tools & Calculators
Free calculators
No signup, no sales pitch. Work out what your heater costs, what size you need, and whether to repair or replace — using the same numbers a professional would.
- Free to use
- Real engineering formulas
- Works on mobile
Each one takes under a minute and gives you a number you can act on.
Heater Running Cost Calculator
What your heater costs per hour, day, month and season — then the same heat priced on all six fuels, so you can see if you're overpaying.
Open calculatorWater Heater Sizing Calculator
Stop guessing from household size. Works out your real peak hour, fixture by fixture, then gives you the tank size or tankless GPM you actually need.
Open calculatorRepair or Replace?
Enter the age, the repair quote and the symptom. Get the break-even maths that tells you whether fixing it is throwing good money after bad.
Open calculatorRoom Heater Sizing
Room size, ceiling height, insulation and climate in — the watts and BTU you need out, plus which heater types can actually deliver it.
Open calculatorHVAC Install Cost Estimator
What a new system really costs for your home size and system type, including the extras that quotes leave out until the end.
Open calculatorFuel Tank Runtime
How long a propane or diesel heater runs on one tank, how many refills a season takes, and what that costs you.
Open calculatorBe first to use the next calculator
We're building one new tool a month. Join the list and we'll send it the day it goes live — along with the winter running-cost cheat sheet.
- All 6 heater fuels ranked by real running cost
- New tools the day they launch
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