The technology may be new but the laws of physics have been around a while and they still apply. Unless the wanderport heater is able to create energy out of nothing it still needs to overcome the same obstacles any other heater does, like losses to the outside, efficiency of heat transfer, electrical resistance, etc. Energy going in will always be equal to energy coming out (one way or another and at various times), no matter how new the technology. It's just a matter of making sure as much of it as possible comes out as hot water straight away, not losses to the outside and/or hot water with a delay. Any heater, heat pump etc can be treated as a black box as far as efficiency goes, where the internal components are irrelevant, all that matters is what goes in and what comes out as useful temperature change done by the device. And in this case how immediate the response is too.
Also, I agree that speculation is undesirable and would love to talk about actual released numbers, but unfortunately as far as the device itself goes that is all we have at the moment. And there are cases where it is possible to prove that an existing device (traditional tankless heater in this case) is efficient enough to where it is not physically possible for a new device to be significantly better, without knowing anything at all about the technology of the new device. I'm not saying that is the case here. And even if it was, there can still be many advantages to our device, like price, longevity, size, less scaling etc etc.
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