Quantity   Component name
1 × Chiller control - Sonoff MINI R2 wifi switch $14
1 × Chiller control relay - Phoenix Contact RELAY GEN PURPOSE DPDT 8A 230V 2903347 $17 Power Supplies / Uninterruptible Power Supplies (UPS)
1 × extraAC open source energy and temperature monitor $200 (Optional)
1 × Glycol Chiller