How To Prevent Bilge On Boat From Freezing During Winter When On Lift - 27' Sailboat

Updated 10/16/2025 | Published 09/30/2025

Products Featured in This Question

Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket - Large - 800 Watts

(3)

$469.00

Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket - Medium - 600 Watts

(2)

$419.00

Question:

I store my 27’ sailboat on a lift, and last winter my bilge froze. Would the XH77FR keep up in that setup?

asked by: Ken

Expert Reply:

Ken, boats on lifts lose heat faster since they don’t have the water’s thermal buffer. The 600W heater # XH77FR will help, but Xtreme suggests either going one size up the 800W # XH27FR or using two heaters if you’re lift-stored. You’ll also get better results if you cover vents or even the outdrive to reduce cold airflow.

Do you have shore power at your dock, or would you be running off a generator?

expert reply by: Andrew N

Ken

10/16/2025

I do have shore power, and I went ahead and covered the vents last year but still got some frost around the pumps. Sounds like I might just size up to the 800W and be done with it.

Andrew N.

10/16/2025

@Ken That’s a solid plan, Ken. The 800W # XH27FR will give you the extra punch you need for a lift-stored sailboat, especially when temps drop fast overnight. With shore power available and your vents covered, you’ll have a really dependable freeze-prevention setup this winter.