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I only use hot water for bathing or washing, but not for cooking or anything else. First, I do not think it is not much more efficient, you still waste water when you turn on the faucet. Secondly, hot water from pipe tends to bring with it some chemicals from the pipe. I admit that I brew beer and make wine, so I only use cold water, even when I sanitise ...


Why didn't anyone suggest an electric kettle? That's a great way to just heat the water you want. You can then pour a little hot and a little cold from the tap to get the temperature you want. They are extremely common in UK/Aus, but still can be found in the US.


The more pedantic may say that this does not directly answer the question, but if you have a microwave I would recommend you put the items in a pyrex with a lid with half an inch (1cm) of water at the bottom and microwave for 5 minutes at full power (make sure the water boils). That is the way we always sterilized our baby things. You are boiling much less ...


Generally, it is not practical to store heat more than a day or 2 since there is no insulation available to prevent the heat to be lost in that time period. Even the best, a thermos or vacuum bottle, only stays hot for a day.


The water heater is significantly more efficient than the stove, with 50-90% efficiency for the heater vs around 40% for the stove. So we have a clear winner, right? Not so fast. There is one key detail missing from the rest of the answers: the distance from the water heater to the sink. You could turn the faucet on and wait until the water was hot, or ...


The bigger question is: is your house being heated or cooled? If your house is being heated, any inefficiency just becomes heat for your house and is not wasted. If you are cooling your house, all inefficiencies become an additional load for your air conditioner. PaulO


The simple answer to your question is yes - it is more economical to start off using hot water to accelerate the boil. As for the other points raised: yes, the water from the hot water tank is best not consumed, but if you are boiling it further I would say that is not much of a concern. yes, the cost saving is not much, but I say if you want to save, ...


Economically, the difference is irrelevant. Let's say you need to boil one liter of water. The specific heat of water is about 4.2 joule per gram degree Celsius. Meaning, for every gram of water that we want to make hotter by one °C, we must supply one joule of energy. A liter is 1000 grams, and let's say the cold water starts at 15°C, and we want to go to ...


Economically, yes it costs less to start with hot water. However, you should use cold water anytime you need potable water. Hot water tanks are generally pretty filthy. If you were to drain your tank, you would probably be disgusted to see what comes out. Cleaning your hot water tank is something that every home owner should do, but very few do. Also, ...


It might be slightly more economical, but it also might be slightly worse for your health. Hot water dissolves plumbing (pipes, valves, fixtures, etc.) much faster, and what it dissolves is in the water. Lead is specifically of concern, particularly with homes prior to 1986 and with infants. There's a NY Times article that sums it up nicely with sources.


If you already have hot water, that you have paid to have heated, and which you would otherwise not use, you will gain time and money by using it. The amount gained is likely to be very small.


You could make an insulated panel that is spring-loaded to the open position. Keep it closed with door holder magnets like this .You could wire the fan and magnets to a double pole switch that cuts magnet power at the same time it turns on power to the fan. Might cost a bit and take some research... but it would be cool (pun intended)!

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