One of the above posts suggest that accumulators are hard on pumps. I guess I would be a bit surprised that that is the case. I am not sure how an accumulator would affect the pump. It still sees pressure all of the time whether there is an accumulator or not. Indeed, I would think the accumulator might keep the pump from seeing any significant spikes in pressure when a faucet is closed. AquaHot is very clear that you must put an accumulator in the water system. I suspect the issue is increased pressure as the water temperature in increased. I would think a normal water heater might have the same affect.Jim