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.
Hot water demand pumps that require activation each time they are used work with both storage water heaters and tankless water heaters. Tankless hot water heaters typically take 10 to 20 seconds longer to deliver hot water to the faucets than a storage heater. The tankless water heater has to first heat the water requiring the water to pass completely through the heat exchanger before fully hot water begins its way to the fixture whereas with the storage heater the hot water is waiting and ready to go instantly when the fixture Is opened.