Heating Fuels

BTU (British Thermal Unit)

The basic unit of heat — the energy needed to raise one pound of water by 1°F.

When you see a heating system rated at "100,000 BTU/hr," that's how much heat it can deliver in an hour. It's the unit every heating contractor uses, even if you've never had to think about it.

Why it matters at home: a heat pump rated for 36,000 BTU/hr is roughly the same size as a 3-ton AC unit. A typical Connecticut home of 2,000–2,500 sq. ft. needs somewhere between 60,000 and 100,000 BTU/hr of heating capacity, depending on insulation, windows, and exposure.

Related terms

Ultra-Low-Sulfur Heating Oil (ULSHO)

Modern heating oil refined to contain 15 ppm sulfur or less — cleaner, more efficient, and easier on equipment.

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Propane (LPG)

A clean-burning liquefied petroleum gas used for heating, cooking, hot water, generators, and more.

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AFUE (Annual Fuel Utilization Efficiency)

The percentage of a heating system's fuel energy that becomes useful heat over a typical year.

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Propane Delivery

Learn about reliable propane delivery and service for heating, hot water, cooking, generators, and more.

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Heating Oil Tank Guide

Sizes, materials, placement, warning signs, and CT rules.

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Propane Tank Sizes Guide

Common sizes, placement considerations, and Connecticut requirements.

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