I don't have one, but consider the nature of the argument of tankless vs. tank. The claim is that a tank full of hot water, just sitting there between uses, loses a bunch of its heat energy and thus is a waster of energy. But where does that "lost" heat go? Into the surrounding room and, by normal air flow, around the house. So you are paying at water tank energy costs for heating your house.
If your water tank is electric, that is usually more expensive heating energy than gas, so you are wasting money and resources. But in this case your tank is gas-heated, and presumably your home furnace is, also. So you are getting the same heat, at the same cost, as if you did it in the furnace instead of the water tank.
All that depends on the idea that you need heat in your house most of the time, anyway. If you're in a colder area that uses a furnace to heat the house most of the time, my argument works. If you live in a hot area where you are running an electric air conditioner to keep the house cool, waste heat from a water tank is costing you extra because you pay even more to remove it! In a moderate-temperature area, the tank does not waste any heat in the winter, but does in the summer.
We had an interesting solution to the dilemma of "enough" hot water when our kids were young. We installed TWO gas-fired water tanks, each about 40 USG capacity, the common model size for homes. They were hooked into the water pipes just in parallel. So we had double the storage capacity of hot water, and double the heat input rate (recovery rate) when it was being used. We literally could have two teens showering, the dishwasher running, plus the washing machine, and nobody got frozen in the shower! The tanks eventually got old and developed leaks, and the kids grew up and left home, so we're back to one tank.
If your water tank is electric, that is usually more expensive heating energy than gas, so you are wasting money and resources. But in this case your tank is gas-heated, and presumably your home furnace is, also. So you are getting the same heat, at the same cost, as if you did it in the furnace instead of the water tank.
All that depends on the idea that you need heat in your house most of the time, anyway. If you're in a colder area that uses a furnace to heat the house most of the time, my argument works. If you live in a hot area where you are running an electric air conditioner to keep the house cool, waste heat from a water tank is costing you extra because you pay even more to remove it! In a moderate-temperature area, the tank does not waste any heat in the winter, but does in the summer.
We had an interesting solution to the dilemma of "enough" hot water when our kids were young. We installed TWO gas-fired water tanks, each about 40 USG capacity, the common model size for homes. They were hooked into the water pipes just in parallel. So we had double the storage capacity of hot water, and double the heat input rate (recovery rate) when it was being used. We literally could have two teens showering, the dishwasher running, plus the washing machine, and nobody got frozen in the shower! The tanks eventually got old and developed leaks, and the kids grew up and left home, so we're back to one tank.
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