They fixed the problem by turning up the thermostat on the hot water heater; and by waiting until after they showered before doing their daily laundry.They commented that they like the washing machine, and that it gets their work clothes clean. 

I have a wifi water heater and wifi thermostats so I can cut back on utility costs when no one is here.

I use Honeywell 9000 wifi thermostats that send me alerts for humidity or temperature levels I configure.None of these items have monitoring or monthly fees.

I've heard of thermostats that you can restrict to a predetermined range.

Its just a matter of communicating your idea to a programmer, and their ability to code it.

I have been a professional programmer - - and I can make the reports appear as I please.The problem with  software is its inflexible - - it's built to solve ONE problem and sometimes not all that well.Finding Properties??

You can travel over with a couple thermometers and hang out for 15 minutes to verify if there's a disparity between the thermostat and the room temperature.

The tenant has a thermostat, run it up a couple points.You obviously don't have real world experience, so please!!!!

Luckily I am married to a woman that is a computer programmer and she has been saving with a 401K for about 25 years so I am not under tremendous pressure.  

One trick, and a good idea anyway if it's not already set up this way, is to have a thermostatic mixing valve on the output of the heater and have the heater set to it's max temp.