
I used a standard 240 volt coil relay and an emylo 240 volt smart switch to build an Alexa controlled switch to voice control my water heater. The box was a little cramped but I was able to fit everything into it including putting a green pilot light on the cover to signal when the water heater is on.

ATPWONZ Junction Waterproof Electrical 5Mm 10Mm
9 Review

Inkbirdplus Dustproof Waterproof Electrical Enclosure
9 Review

Protect Your Electronics With Zulkit'S Blue Metal Enclosure: DIY Project Case With Preventive Features (9.1" X 7.3" X 3.9")
13 Review

Zulkit 5Pcs Black ABS Plastic Project Boxes - Ideal For Electrical And Power Junctions (80 X 50 X 21 Mm)
10 Review

🔌 Robertson 2P20132 Quik-Pak: 10 Fluorescent eBallasts for 2 F40T12 Linear Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, Normal Ballast Factor, NPF, Model RSW234T12120 /A (Crosses to RSW240T12120 /B)
4 Review

Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review

Wireless Electronic Ballast Interface Certified
8 Review

💡 Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review