Rapidly rising cost of gas plus the fixed monthly supply cost for it has caused me to move my water heating from instantaneous gas to electric. I was paying about $50 per month in total for gas. Changing two cooktops over to electric was going to be too expensive so they have been converted to LPG jets/injectors and will now run off two 9kg BBQ bottles. I estimate I will use about six bottles per year, so $120. I only have a small space for water cylinder installation and therefore needed a skinny tank, but tall so it’s still good volume. I also wanted to avoid having to install a new power circuit for it as that would have added at least another $1,000 to the job. JR Gas and Water supplied an Enviroheat 250EH1-15 heat pump which can run off a standard GPO since the compressor uses only ~500W and it has a ~1500W resistance element as backup or for boost. So even using both it is the same power consumption as an electric kettle. Brandon and Lachlan did the water heater installation one afternoon and came back the next day to change the cooktops to LPG and do the gas bottle changeover valves. They were professional, polite, friendly and happy to discuss the job details with me. JR Gas and Water have promptly provided the certificates for both the water cylinder and gas work. From a cold start the water heater took 7 hours to get up to the 65 degree set point without using the boost. Routinely it takes 2.5 hours to get back to temperature each day after providing four showers in the previous 24 hours. So it costs an amazingly low six cents per day using my solar power and assuming I would otherwise have got 5c/kWh as FIT for the electricity. It will be a little higher in the winter when the inlet water temperature is a bit lower and the showers perhaps a little hotter/longer. The water heater produces a noise level similar to that of a small air conditioner outdoor unit. We will be running it on a timer in the daytime only so the noise is just not a problem. The water system is easy to program and has various modes and timers available. It doesn’t have remote/wifi but once the novelty wears off it’s probably not something I want to be looking at every day anyway. Overall I’m extremely happy with having done this (and previously getting the solar system). I’ve also got a Tesla Powerwall which will probably not pay for itself in its lifetime, but does come with an extremely useful app for monitoring home power usage (better than the one provided with the solar inverters).
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