Two-speed burner, multi-speed blower

[streel]

Hello,

Two-speed burner and/or multi-speed blower...

How much influence do these two technologies have on a furnace's operation?

Thanks.

[millerman]

2 speed burner? Or maybe 2 stage or modulating. Answer is;
Better comfort and efficiency.

[beenthere]

2 stage is better comfort, but I'd get a VS blower instead of the multispeed.