"I don't see why you would need (or want) water that hot for a soaking tub. The main tank is the 120 gallon."
Because soaking tub holds 100 gallons. The Thermal Accumulator is no longer used for DHW, it now contains nasty boiler water + it is now kept at lower temp. to allow for higher Eff. when HP is heating it.
"Are the tanks constructed in such a way that it would be reasonably easy to add copper tubing inside?" Not Possible.
"Does the boiler have its own tank or is it a tankless?" Boiler = CI NG, no tank but weighs 300# & holds several gallons.
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