How We Collect Prices

Sources

Prices come from the seller's own price list or product page, or from an authorized dealer when a brand does not publish prices. Every guide lists its sources and the date checked.

What we record

• The lowest listed price for the base configuration on the check date
• The regular price shown next to it, when there is one
• Published wattage and circuit requirements, where the maker lists them

Shipping, tax and electrical work are left out unless a guide says otherwise.

Running costs

We multiply published wattage by time and by the U.S. average home electricity price from the Energy Information Administration. Results assume full power, so they are upper limits.

Picks

Our "best" lists use published price, heater type, power needs and warranty. We do not claim hands-on testing unless a page says so, and we do not rank products on health claims.

Updates

We re-check prices monthly and change the date on each page when we do. The seller's page is always the final word on today's price.