It will draw lots of amps and there are many superior ways to make coffee using water heated on a flame (I prefer French press but there are lots of ways to skin this cat --drip, percolator, etc.).

Also don't worry about keeping up with faster boats. You won't. They'll see you later. In a 27 foot boat you need to figure how far you're willing to go in a day, whether you want to sail through the night, and plan your landfalls for daylight.

Keep this in mind if you want to have a pleasant experience:

1) Sailboats and schedules don't mix. You shouldn't set out if conditions are likely to be unpleasant or if the schedule requires constant motoring.

2) The joy of sailing is in the experience, and the vacation is where YOU are. If winds are light don't go as far. If the winds are on the nose change your destination. If there's constant rain in the forecast plan to get to a harbor in advance that offers attractions ashore. Say "adiós" to your sailing buddies if they don't agree to make those adjustments. You and your wife/crew will have a better experience, and come back more relaxed. Make the most of what the weather hands you. (If you don't follow this advice you will think about it later and wish you had).