110v heaters come as a maximum(generally) of 1500 watts.
Almost all heaters are at that wattage. Some have a low setting but the high setting will be 1500w.
And
We use electric blankets.
The inexpensive ones will work with echo, the digital ones will not.
And
Amazon search: heated toilet seat.
$35 to $300.
https://www.amazon.com/gp/aw/d/B0128...b_b_asin_image
https://www.amazon.com/gp/aw/d/B001R...b_b_asin_image
We have these two types.