“This model is not for 100% biofuel (only up to B5). In MA, some heating oil is B20, so I used the metal variant. The see-through plastic housing is great for spotting air leaks.”
“I bought the Tigerloop because my furnace ran rough on cold oil. The Tigerloop circulates fuel near the furnace, giving it time to warm up. Installation was straightforward but messy. Used Blue Monster on threads—no leaks. Waiting for more cold weather to test.”