Very good bit like (hotties) once we got fire to temp we put on on and let it flame up then turned it right down and burned for 2 to 2 and half hours on one put another one in adn turned it up to flame then turned it right down again for another 2 1/2 hours put a bit a bit of peat briquette on and it kept hot till next morning. Ash not a problem bit more than usual but not mountains clean burn very happy and intend to get them for next winter and cut down on bought wood
2 briquwttes on low setting last aout 8 hours or so in my logburner im truly amazed they keep the chill off on low and if it really cold just turn the burner up.
theres no mess nothing heavy to carry anmd they make a good conversation piece on the fireplace. they are made from waste woood so they are carbon neutral reccomend