How Much Wood Will Fit in a Fröling FHG 20/30 Wood Boiler? By Travis PaigeJanuary 6, 2012August 16, 2022Products, Videos Well, Let’s find out… Here is a quick video showing how much wood will fit in the firebox. How Much Wood Will Fit in a Fröling FHG. For more information, please go to our website. Please leave this field empty WANT MORE? SIGN UP TO RECEIVE THE LATEST TARM BIOMASS BLOG POSTS. Email Address * We don’t spam! Read our privacy policy for more info. Check your inbox or spam folder to confirm your subscription.