Well its a brand new water tank. Toquote its blurb "it has a stainless steel inner vessel, and an outer casing is a combination of resilient thermoplastic mouldings and plastic coated corrosion proofed steel sheet. All products are insulated with CFC free polyurethane foam to give good heat loss performance"
So to answer your question, I don't know!! :)
Interestingly after they installed it, we had to use it manually until the electrician came and did his bit and wired up the timeclock. When he did this, he inadvertently wired up one wire wrongly which meant that the water heater wasn't working. But it was not until the next night that we realised when the water was all cold. By that time we had dinner dishes done, night shower, morning showers, evening dishes all from the tank so I reckon it must be quite well insulated!
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