I'm looking to invest in a pool and spa heater, I've settled on the big RayPak 406k btu (model:PR406AEP). I want to pair it with both the pool and spa (seperate pumps, filters, etc). I understand the plumbing aspects with the needed diverters and check valves. I'm also trying to future proof for possible automation in the future.
My question is regarding the operation of the heater with two different types of pumps. The pool has a new Intelliflo VS. The spa has an old pump with a 1 1/2 hp single speed motor (brand unknown but likely a Sta-Rite product since that is the filter brand).
For the pool, is it acceptable to leave the heater "on" all the time (i.e ready to heat) and just set the run times on the Intelliflo. So when the pump does come on, the heater will heat when necessary.
With the spa, I would guess the heating would be more "on-demand" so we'd just switch the diverters to the spa side, click the "spa" button on the heater and start the pump. Then switch it back when done.
Is there anything wrong with this setup? I've seen information about a "fireman's switch" on other heaters so that the heater shuts down before the pump, but the Raypak barely references one so it wouldn't appear necessary. I'm guessing this is because there is no blower in this model?