Quote from @James Wesley: No, it doesn't need to be drained every time.

In San Diego I recommend descaling tankless annually and this is significantly more effort than draining 5 or 10 gallons from a tanked heater and changing anode every 5 years (by the way always use impact wrench to extract old anode as breaker bar can move water heater messing with other connections).  

You shouldn't drain $200k from a stock portfolio to get this deal done.

As far as humidity, could just put a dehumidifier with a pump going to a drain/sink.

@Brandon GaleThis might be a really bad tip, but one thing thats really helped with my frustrations is using ChatGPT to write responses to those particular type of guests 😂 I’ve noticed doing that is much less emotionally draining than thinking out a diplomatic, compassionate response to an unreasonable person. 

Odds are the drain line, condensate pump, putting down new riser blocks or mounting blocks, the whips and line sets, new disconnect box, new low and high voltage wiring aren't in your Google pricing.

Nobody in the world has a sewage meter, it's based on the water use since all water used has to go down a drain eventually.In order to install a meter you need to access the line feeding the unit.

Because they have found it a time suck, a brain drain, stress factory that takes away from everything else in there life including scaling and to time leverage is worth it's weight in gold. 

Everything you've worked for goes down the drain.

Cast iron drain lines might last 50 years or 150 years!