The beauty of an Axeman Anderson is that it can ramp up to full fire from a dead idle in just minutes. So it rarely has problems keeping the water temperature up for heating the DHW.
The AA260 has a lot of water in the jacket, so the thermal mass is pretty big as well.
I use a plate water/water heat exchanger to preheat the cold well water before it goes into my DHW heater, the thermostat is turned way down, somewhere around 100*, so if I've not used hot water for a day or more, the propane will keep the tank at least warm,,
With the first call for hot water, the replacement 'cold' water is actually usually 160* or so, so my DHW is never cooled off.
If I remember to, I will run a few gallons of hot water in the evening if I'm not doing dishes or laundry, just to 'charge' the
DHW tank with hot water.
Not a perfect system, but I dont want yet another circulator running in the house.