I have an tankless hot water heater in my oil furnace which does not put out enough hot water. I was thinking of adding an electric hot water heater or a storage tank, but can’t find any good info. Need help!
Contact a licensed Master plumber and have him / her install a flow restrictor to allow less water (Volume) to pass through and this way it will give the coil more time to heat the water passing through. You may also want to consider the use of low flow shower heads and faucets. ( flow restrictors) This is a lot cheaper than installing a holding tank with a circulator.. GOOD Luck Sylvan