In this scenario we see that the heat in- and output does not match.

If we zoom in on the heat flows we see the following:

The biomass and network gas flows are equal (both 0.93 PJ)
This is because in the query behind the biomass flows to heat, we count the greengas/network gas flow that is used in heat production.
This flow is also accounted for in the network gas to heat query.

I therefore propose we remove this flow from the biomass to heat query.
@mabijkerk @kndehaan what do you think?