Storage and its cost is a stumbling block for many who have/want gasifiers and are concerned about efficient operation. Is the following a workable idea that may help ease this question: The idea is based on the Tarm but I assume it is usable with any gasifier. Typical boiler plumbing is boiler supply to Termovar/mixing valve to load and to boiler return. Insert a (used) hot water heater tank between the boiler supply and the Termovar/mixing valve. This would have the effect of increasing the boiler system capacity, so with the Tarm, for example, boiler system is about 50 gallons, plus a 40-80 gallon electric hot water tank = 90-130 gallons of boiler system water. This would result in a longer burn to bring system up to temp and to return to temp after cycling, and should increase efficiency accordingly. Advantages: reduction in plumbing costs, valves, etc. associated with traditional storage; increased simplicity in system. Disadvantages: longer time to come up to temp from a cold start; need larger expansion tank; need to obtain a (used) hot water heater. What do you think?