AtishD

I've been using a CBI Astute and I wish it had more detailed stats that one could look at daily. Also you need to register as a Developer on the Tuya IoT platform in order to link it to HomeAssistant. I think it may be better to go with a GeyserWise setup instead of just a Geyser Monitoring system like the Astute. It makes sense to be able to control the temperature as well which you can't do with the Astute or Sonoff.
 
If anyone else has better solutions for this I'll be keen to try them out, I'm looking at upgrading my CBI Astute to a Geyserwise soon.

I have one geyser with a Geyserwise TSe + Geyserwala and another geyser with a Geyserwise TSE1 with Tuya Wifi. For the same money, I would say a standard Geyserwise (TSE) with the Geyserwala is the way to go. Both work well thou1gh. Both give temp info which is great. Pp Tuya is a pain for Home Assistant though. 

I have installed the Tuya 16A Smart Switch with temperature and humidity sensor Smart WiFi Temperature & Humidity Switch | Grow Tents or Nursery (tuya-smarthome.co.za)
This currently works well for my needs.  Please note that it is rated at 16A which means the geyser element should not exceed 3kw (preferably 2kw).  Also note that the sensor is rated to a maximum of 55C (Sonoff sensor to 50C).
I believe the most reliable option is the Geyserwise Tuya module Geyserwise TSE1 Tuya Smart WiFi Module Geyser Controller Kit | LiveStainable which replaces the thermostat and can carry 3kw elements.