Thanks so much for the info!
I’ll give this a try and see if it works. I have also bought a broadlink RM because i was having issues with the Wemos and IR Shield so i’ll see if i can get it to work with either. I’m also not 100% sure if my Rinnai heater supports IR. It has a remote holder but I can’t locate a receiver or a mention of it in the heater manuals.