Hide the furnace & heater behind painted shutters or bi-fold doors- ventilated & easy to move (A folding screen made from bi-fold doors. Note the wrapping paper they put in the Ikea cabinet doors. The water heater.
17,700 BTU/Hr Direct-Vent High-Efficiency Natural Gas Wall Furnace Heater
10 Vital Home Maintenance Tasks You'll Regret If You Forget - You probably already have a home maintenance checklist: Replace the furnace filter each season, shut off water spigots before winter, clean the gutters, etc.