Hybrid heat pump water heater

Are the fans in these HPWH units 120v while the compressor is 240v? It could be that the on/off events are triggering on some 120v subcomponent and that’s why only half of the compressor power is being picked up? I just fired my GE Geospring up for the year. Waiting for it to be redetected, as I had to replace my monitor over the winter while the water heater was off for the season.

Edit: nevermind, these water heaters don’t have neutral connections. No 120v loads.

So, how are you using a 220v device on an HS110? I’ve seen this mentioned, but don’t know how people are (legally) doing this.

Several sites have verified that the HS110 supports 240V @15amp max. I think this is because they are used in Europe with a different plug. I temporarily wired a plug and connector between the HW heater and the power supply so I could plug it in, and set it for Efficiency so the resistance heater isn’t envoked. I will put it all back at the end of the month, and I don’t advise doing this unless you are comfortable with working with home wiring. I installed the water heater, so I was familiar with the wiring requirements.

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They are not doing and staying within code. Anyone with the knowledge to rig it up is probably very well aware and using it temporarily

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Thanks. That’s helpful. I was aware that the European HS110’s and the US aren’t really different internally, just in plugs. But things like well pumps don’t “plug in”.

I’m an EE, and have done lots of wiring over years while renovating multiple old homes, but I’m also a strong believer in following the codes…both for safety and for insurance/legal reasons.


I wish someone had a product like the HS110 that could be direct wired inline to a circuit. I wired our Aquanta water heater controller myself. You wire it inline and it sits on top of your water heater over the power connection plate. In addition to providing a timer feature, it will automatically control temperature based on some adaptive algorithm that it uses to optimize the set temperature based on the history of your hot water usage. It also sends usage data back to Aquanta central so you can see your usage. It provides a useful benchmark for Sense’s estimate of usage. I’ve found it to be accurate ±15%.

OTOH, I doubt such a product would ever come to market because so few people would buy it.

Oh, another product I dream about is a connected power-monitoring circuit breaker. I think the big problem there besides space availability is that they’d have to make models compatible with each of the big circuit panel companies.

I suppose the most likely thing is that Sense becomes wildly profitable and they create an expansion model with extra current probe clamps for problematic circuits.

Neat device, Aquanta, thanks for mentioning it.

I too keep hoping that Sense, or perhaps Sense in partnership with TP-Link (who already has 240v monitoring…but with European plugs) would bring out a “direct wired in-line” module. Given the number of people that need to monitor such devices in the USA, I think this would actually have a significant market.

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Hey, I’d like to see that too! It is odd that in-line 240V smart plugs (even non-water heater specific) don’t exist. I’d imagine there are some code issues preventing it, as it does seem like a product with a significant market.

I sent the following to TP-Link marketing folks. Who knows what/if anything will happen?

I’m a current customer, in the USA, and I have a number of your HS110’s, some connecting to my Sense. One thing that I’d really like to be able to buy is a 240v version of the HS110 that is a module with wire lugs (or wire tails), rather than European plug/socket.

The reason is that many devices here in the US run on 220/240, and it’s not legal to hack something together with your European HS110 to monitor them. Following the device detection thread on Sense’s support site, it sounds like a bunch of other customers would also grab such a product, because Sense doesn’t detect (“sense”) these very well on its own.

Perhaps you could partner with Sense to market these in the US to their community?

Since you already have such capability, buried in your European HS110, it seems to me that this would be a fairly minor re-packaging effort, although I do suspect some code testing would also be required.

I’d be glad (and pay for the units) to be a beta tester ((-;).

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I don’t have space for any of the hybrid water heater models models but I was tempted to explore the Nyle retrofit heat pump (discussed here) … which no longer seems to be available (small ones at least). Anybody have something like that?

Still no detection here. Sense mistakenly detects the heat pump startup as the pool pump.