Not sure if this circuit will work, did I overlook anything?

[yamadanao]

I plan to purchase a DS18b20(here is the datesheet:http://www.componentschip.com/pdf/6a-DS18B20-T-R.pdf)water temperature probe, and hook up the data line to an arduino. I would then connect the arduino to ten 5VDC 6A relays , and each relay would be connected to a 120VAC power source and a 300W heater. The resulting circuit will be able to control the temperature of a curing tank I've built, when temp hits 73degF, the arduino will send a LOW signal to all the relays, shutting off the heaters. When temp drops, the arduino will send a H signal, turning them back on. What do you all think? Opinions are much appreciated. The picture included is one heater to one relay.

[mbozzi]

I think you need to worry about the instance where the temperature is rapidly fluctuating around 73 degrees in order to avoid thrashing.

This will prolong the lifetime of your hardware - the relays, especially.

You may want to investigate PID feedback:
https://en.wikipedia.org/wiki/PID_controller

[48T7M4Gy]

https://playground.arduino.cc/Code/PIDLibrary