Sounds very similar to the NASA ships used by astronauts. They call it a thermo coupling heat redistribution unit. Reduces energy use on long voyages.  Residential use is an excellent idea. You may want to cover the pipes with a insulator substance.  Increases efficiency.  Also without altering this tried and true design you may wish to collect the electrons from the biodegrading of the waste material. This would be with a collector caller  a biogenerator.  Same principle. Free.

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Sounds very similar to the NASA ships used by astronauts. They call it a thermo coupling heat redistribution unit. Reduces energy use on long voyages.  Residential use is an excellent idea. You may want to cover the pipes with a insulator substance.  Increases efficiency.  Also without altering this tried and true design you may wish to collect the electrons from the biodegrading of the waste material. This would be with a collector caller  a biogenerator.  Same principle. Free.