How We Collect and Check Prices

Every number on this site should be traceable. Here is how we get them.

Where prices come from

We read prices from the seller's own product or collection page, or from an authorized retailer when the brand does not sell direct. Each guide lists its sources at the bottom with the date we checked.

Which price we record

• The lowest listed price for the base configuration on the check date.
• The regular price shown beside it, if a sale is running.
• Not included: freight, tax, options and installation, unless a guide says so.

Cost ranges for services

Electrician and installation ranges are published ranges from sellers and installers, named in the sources. They are guides for budgeting. Your local quote is the real number.

Running costs

We use heater kW times hours times the U.S. average home electricity price from the Energy Information Administration. Session costs assume full power for the whole run, so they are upper limits.

Our picks

"Best" lists are based on published price, materials, included parts and warranty. We do not claim hands-on testing unless a page says so.

Updates

Prices are re-checked monthly and the date on each page changes when they are. If you spot a price that is out of date, the seller's page is always the final word.