How much water can two domes heat?

Each dome covers roughly a 23-inch circle, so two cover a small area. Treat them as spot heaters for a small pool or hot tub, not whole-pool heating.

Does it need electricity or a pump?

No. It is a passive solar cover that traps warmed air over the water, so it runs with no power, plumbing or moving parts.

Only weakly. Output depends on direct sun, so expect modest gains on overcast days and little help in cold weather.

It is designed to float on the water, but strong wind can push it around. Many owners remove it when the pool is in use.

Two solar dome heaters with transparent covers. Check the listing for any stakes or tie-downs before you buy.

Rated 3.8 out of 5 from 6 ratings.

$425.99at Bed Bath & Beyond, last seen Nov 7

Prices change often: ask the agent below to check today's price at every store.

Prices are checked against each store and labelled with when.