Made an interesting discovery today when tinkering around with a different type of grouphead thermometer. I was under the impression that the ideal mounting of a thermometer was with the tip in line with the edge of the water gallery that goes downward toward the water diffuser and shower screen as per the image.

I discovered on my VBM that TheBat device has the sensor tip about 3mm past the bottom of this opening. May need to try an extra washer or 2 although it does seem to work ok as is.
I made a simple gauge to measure the position of the opening as it heads downward. Did see this somewhere a while back. The gauge is a straightened paperclip with a tight fitting piece of insulation stripped off a wire. The hook end is carefully slid down the hole where the thermometer mounts, until the hook drops into the opening heading downward. Raise slightly until you locate the upper edge of the opening. Hold steady while you slide the insulation sleeve down the wire until it stops at the surface where the washer normally sits. This will give a dimension to be able to judge where the thermometer/thermowell tip sits.

On the Vibiemme, there is 10mm between where the washer sits and the top part of this opening/gallery heading down to the diffuser/shower screen. The gallery seems to be around 2mm or so to the bottom making 12mm overall. TheBat mounting screw ia 15mm from the washer contact surface to the tip.

I discovered on my VBM that TheBat device has the sensor tip about 3mm past the bottom of this opening. May need to try an extra washer or 2 although it does seem to work ok as is.
I made a simple gauge to measure the position of the opening as it heads downward. Did see this somewhere a while back. The gauge is a straightened paperclip with a tight fitting piece of insulation stripped off a wire. The hook end is carefully slid down the hole where the thermometer mounts, until the hook drops into the opening heading downward. Raise slightly until you locate the upper edge of the opening. Hold steady while you slide the insulation sleeve down the wire until it stops at the surface where the washer normally sits. This will give a dimension to be able to judge where the thermometer/thermowell tip sits.
On the Vibiemme, there is 10mm between where the washer sits and the top part of this opening/gallery heading down to the diffuser/shower screen. The gallery seems to be around 2mm or so to the bottom making 12mm overall. TheBat mounting screw ia 15mm from the washer contact surface to the tip.

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