So let face it guys.,You don't have to be an economist to understand this simple logic.,If you are building a house, no matter what you will need a septic tank especially if you are outside of municipal sewage line, to build a septic tank costs between $800-$3000 depending on the size and location. To build a household biogas digester septic tank… See more will cost you a minimum of $1650 depending on your location. Energy- A household will use between of 6kgs and 9kgs of LPG per month which is valued at $12-$18 per month.

$1,650

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