Recommendation for home brewing 

Recommendation for home brewing 

1) Controller
EZboil (Recommended for electric heater)
EZboil is a digital power regulator/controller designed to automate the liquid boiling and mashing processes. For boiling mode, it provides linear and uniform power output with 1% resolution. For mash mode, EZboil can hold the temperature within one degree right out of the box. 
SYL-2352
This is one of the most popular controller. It has Fuzzy logic enhanced PID mode and Manual mode. The manual mode is useful for control the boiling over problem.
SYL-2362
This controller is also very popular for this application.
SYL-43x2
If want a large display, this is the controller to use. Please make sure to select the SSR output.
SYL-2381-SSR-S
PID controller with RS485 port. You can check & change its settings remotely over your PC or compatible devices. Please make sure to select the SSR output model.

2) Sensor
This RTD sensor is the most popular for the brew application. It offers a fraction of degree accuracy.
PT100-L100NPT
PT100-L50NPT
PT100-L401/2NPT
PT100-L1001/2NPT
You can also use thermocouple sensor that is cheaper. It gives about 3-5F accuracy.
TC-K50MMNPT
TC-K100M1/2NPT
TC-K100MMNPT

3) SSR
The 25A SSR with heat sink is the most common. You might need two sets if more than one heater is used. Each controller can drive up to 5 SSRs in parallel
25A SSR
Heatsink for 25A SSR
A 5500 watts 240v heater draws 23A of current. It is close to the 25A SSR’s limit. Some people use the 40A SSR with heat sink for extra capacity and safety.
40A SSR
Heatsink for 40A SSR

4) Switches, Buzzers & Indicators

5) Wiring examples.
A) These links gives good wiring examples.
homebrewtalk.com
brewboard.com
brewboard.com
wortomatic.com
B) This is also a very popular post that many people has followed. However, the controller model on the post is wrong. It should be SYL-4352 (SSR output) instead of SYL-4342.
homebrewtalk.com
C) This is a recently published article by BYO. Many people are following the example.
byo.com
D) A perfect example to build the Electric Brewery product for passionate brewers.
www.TheElectricBrewery.com

6) EZboil controller selection guide for Three-Vessel brewing systems
Three EZboils can be used for three-vessel brewing systems, which can not only provide precise temperature control, but also a professional look for the symmetric fronts. Different EZboils can be used for different vessels: 

Hot Liquor Tank (HLT): EZboil DSPR320 is recommended for step mashing. For single infusion mashing, DSPR300 is recommended. 

Mash Tun (MT): One thermometer is needed for MT. For HERMS system, DSPR120 is recommended (similar price to standard PID, similar look to other EZboils). If you need to use external alarms for MT, you can use DSPR300. For two channel readout thermometer, SYL-2802 is recommended. 

Boil Kettle (BK): DSPR300 is recommended. If you need multi-event timer for adding different hops, DSPR320 is recommended.