Originally Posted by misled_drummer
That means I would need to purchase an additional SSR and Heatsink just for the pump? I wouldn't be able to have them on the same circuit?
The short answer is yes. The long answer is no, but you must ensure that your receptacle and SSR that you choose are rated high enough for the load.
The reason I quickly said you wouldn't be able to have them on the same circuit was that pumps, when first turned on, have a much higher current draw to overcome being at rest, which quickly spikes down to normal operating current. That spike of energy has the potential to fry electronics so just be aware of that. However, if you're comfortable with that, then by all means put them on one receptacle with only one SSR.
That being said, let's take an example: If you choose to operate your RIMS on 120VAC and your heater element is the popular 1500 Watt version, then your circuit should be sized like this:
1500W/120VAC = 12.5 Amps
Typical March 809 Pump draws 1.4 Amps on 120VAC (look here
for March Pump electrical req'ts)
Total = 13.9 Amps * 1.25 (25% Overcurrent Protection) = 17.375 Amps
Just be careful and make sure to buy plugs, receptacles, etc. rated for the next higher common amperage size, which will be 20 Amps. A lot of commonly found electrical components at places like Home Depot are default rated for 15 Amps, so just make sure to pay attention and grab the 20 Amp or greater rated ones. For your SSR, I would size it for 30 Amps and then you'll not necessarily need to buy a heatsink, as the 17.4 Amps needed to run this circuit is well below the 30 Amp capability of your SSR and it should therefore not heat up all that much. Hope this helps.