theres no prescription here. but i go for “hot as i can get it by boiling off the water i can get to rest on it by then microwaving it”. for me thats a good tradeoff in time, effort, and energy/water waste. no clue if it really helps the brewing that much but it stands to reason that the ceramic does steal some heat if its room temp. i do it right before. brewing. i also freeze my cup, so the resulting coffee winds up being perfect drinking temp right away after its done brewing xD











yeah, this happens for me when microwaving water in clean glass container. not pleasant, it goes off like a bomb in there. have mitigated it by putting a wood stick in the water, but later learned to just measure the water carefully and run the microwave only as long as needed.