What Are The Most Eco-friendly Methods Of Heating Water In A House?

Our water heater is looking very sad and yesterday our neighbors burst. I took it as a sign.
My husband wants to get a tankless water heating system.
I’m wondering which methods are most eco-friendly, energy saving, etc.
I don’t think we can afford solar panels.

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What Methods Are Used In Designing An Eco Friendly House?

I am doing a design project that requires to be an eco friendly home, i know what eco friendly means, and what it is, just not familiar with what and how to design an eco friendly house.

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