I purchased and Installed this 20 gallon electric hot water as they advertised for POU for Point of use hot water.Currently the price of Natural Gas just increased from 60 cents to 90 cents per CCF.But, my electric bill is price locked for 3/4 cent for the next 6 months and then increases to .80 cents.Currently Electricity cost less than natural gas.So I installed this and followed all the specs. Output from my NG Hot water heater to this POU HW Heater.The literature states that the heater needs about a 4 hour recovery time. I am actually watching a 2 hour recovery time. The water is set at 135 degrees and was delivering almost scalding hot water. For a shower you need about 15 gallons of hot water and the tank which is actually a boiler and stores 19 to 20 gallons of hot water. After a couple days I shut down the Natural Gas Hot Water Heater and am currently using only this Ariston POU 19 Electric Hot Water heater as my only source for Hot Water. Works Great for 2 people.Due to the current Natural Gas Price increase and the not as aggressive Electricity Price increases this item appears to be a great bargain for hot water. Takes about one and half hours to install using copper and copper fitting and sweating the pipes and I installed one shark bite ball valve. Could be installed faster using all Shark Bite. For the wire I installed a 20 amp circuit breaker into the Main and installed a 20 amp extension cord that is under 25 feet. I will probably change the circuit to hot wire. Makes a Great Hot Shower.Installation was as easy as attaching hot, cold, and a wire to the breaker box. That was it.It heats well enough for a 10-minute shower, so short or long ones work fine.Installed in my 5th wheel camper, replacing the propane/electric combo. Easy conversion, I had to redo the hot and cold lines for a short distance. Wasn't a problem using the pex fittings and pipe. Much better looking installation than the junky way they install the water heaters in these campers. Happy camper.replacement, product was as specifiedPerfect size for cabin.Compact easy to install. Only need 110 power, can be concealed in a small cabinet. It supplies two sinks and gear washer.Great volume and recovery time. highly recommend.Perfect install instruction, easy to handled, connect and adjust.product just what i needed