If you want to get into the nitty gritty of an instant hot water supply, I would check this out. For less-than-huge usage it may be the more efficient way to go, especially if you like a lot of green tea at 160F:
If you want to get into the nitty gritty of an instant hot water supply, I would check this out. For less-than-huge usage it may be the more efficient way to go, especially if you like a lot of green tea at 160F: