Have tried burning wood briquettes recently in my stove. Are very clean with very little ash but wouldn't rely on them to keep fire in for long periods so still burning smokeless coal/anthracite mix at €15 a bag (wood briquettes were €4.20 for a bale of 15). Bag of coal lasts me 3 days, bale of briquettes 9 hours, so costing twice as much!