Boiling water without burning it

Just use tomato sauce and tomato paste - and choose the sauce w/o tomato pieces. I use sauce w/tomatoes for chili, but not for spaghetti sauce. Mine is a meat-based sauce, but I'd think it would work without, just thin: ground beef, 2 small cans of sauce, 2 small cans of paste, onions, garlic salt, pepper, oregano, water. Or putting the crushed tomatoes into a food processor.