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Thanks again Marty. Since some time has passed since our purchase, we have learned quite a bit about our on demand hot water system. Basically, it needs a minimum amount of water flow to operate, so we turn the hot water all the way on and adjust temperature with the cold. However, this doesn't work for the bathtub because the heater is capable of heating a maximum of 1.5 gals. per minute & the tub draws more than that. Before we learned this, we were unsatisfied with the tub because the water was only luke warm. Now we turn the hot water faucet for the tub about 1/3 on and we get very hot water!
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