Make no difference really, it takes x number of btu's to keep your home at let's say 73 degrees. Your home will still require that same number of btu's regardless of how fast the fan is running.
Some installs are done where the fan never shuts off and a zone valve or "close t" are used to allow heat into the coil t certain times.
Seeing you built your own stove, which is fine, but makes me hope you didn't build your own underground line as well?
I've been around this stuff a lot and never have seen a homemade line that was worth burying