To make sure you're not testing too early, assume the sperm had very long lives (5 days is considered a very long sperm life) and that conception occurred then. Then allow 14 days for the embryo to implant and develop enough hCG to show up on a pregnancy test (96% of pregnant women will test positive by then.)
A gas water heater will recover in half the time of an electric unit. A 40-gallon gas water heater can recover in about an hour. Recovery for a 40-gallon electric water heater takes about two hours.
Country: How long would it take to heat up completely a bog standard copper cylinder with a cheap immersion heater. Plus can you tell me how long that water should retain it's heat for bathing. When i had new heating fitted 4 years ago both were replaced but only cheap parts were used.