On the latent heat problem, I wonder how the math works out if you put a dehumidifier in the bathroom to counteract the effect of leaving warm water standing ar

On the latent heat problem, I wonder how the math works out if you put a dehumidifier in the bathroom to counteract the effect of leaving warm water standing around. What's interesting about that is that you'd effectively be using the dehumidifier as a heat pump, indirectly pumping the heat out of the water and into your home, leaving you with cold water in the heat pump's reservoir. You're adding energy, but that energy also ends up as heat, so you'd still certainly end up ahead compared to using electroresistive heating (but not necessarily compared to a traditional heat pump). My guess is that it would be a lot more effective to _directly_ pump the heat out of the waste water, but you can't do that with off the shelf appliances.