They seem to be promoting a water heater that uses a heat pump [1], which purportedly saves up to 75% of the energy bill [2]. I think this seems more viable in

They seem to be promoting a water heater that uses a heat pump [1], which purportedly saves up to 75% of the energy bill [2]. I think this seems more viable in the short term. [1] https://rinnai.co.nz/blog/water-heating/what-is-a-hot-water-heat-pump https://rinnai.co.nz/blog/water-heating/what-is-a-hot-water-... [2] https://rinnai.co.nz/water-heating/hot-water-heat-pump/hot-water-heat-pump/hydraheat https://rinnai.co.nz/water-heating/hot-water-heat-pump/hot-w...