Observed arrival · 2026-11-13
Cord & Tank turns fuel prices into comparable heat costs
A calculator compares firewood, propane, heating oil, pellets, gas, and electric heat by the cost of an equivalent amount of heat, using prices you enter.
- For
- U.S. households comparing heating-fuel costs
- Worth noticing
- The site reports 45 calculation checks, including cases where the calculator should return no number.
Field notes
The page normalizes user-entered prices to equal heat output, with comparisons spanning firewood, propane, heating oil, pellets, gas, and electricity. It reports checking its calculations against 13 worked examples in published sources and 45 checks overall, including cases where the tool should return no result. The site identifies its figures as U.S.-based, names government, university, and supplier sources, and says entered prices remain in the browser.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
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