Thermal Mass Component

I’ve been searching high and low for a thermal mass component to do some simple energy / temperature / mass simulations.

I’ve installed Ladybug, Honeybee, HB Energy, HB Radiance etc. but no luck.

I could script my own but I’m surprised a component doesn’t already exist. Maybe I just haven’t found it yet?

I need something that has inputs like…

Specific Heat Capacity
Initial temperature
Energy Input
Energy Output (draw)

It could represent a real object like a water tank and as such could also have inputs like…
External temperature
Heat loss (insulation)

The main output would be temperature.

I don’t want to reinvent the wheel so dose anyone know if something like this exists?