geothermal water heater? or tankless?
I had planned for a year to go with a tankless water heater, a concept I first encountered in Spain. My building consultant, however, is encouraging me to use an electric, foam-insulated tank heater assisted by our geothermal system. Is there a real energy savings advantage to one over the other? Is one more reliable (less maintanance) than another? I want to achieve environmental conservation and cash conservation, but not at the cost of constant maintanance. Thanks for any help you can offer!