Biogas and natural-gas booster pumps

YUN lists YL and DCY booster pumps for household boilers and biogas stoves when inlet pressure is too low to hold a flame. Models on the source catalog run from the 25 W YL-01L / DCY-06L through the 100 W YL05L. Some units are AC only; DCY-06L is listed as 220AC / 12VDC / 50HZ.