should the electric heater be installed before or after the domestic supply and what pecautions are necessary
Yes it can, but you better know what you’re doing.
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I’m assuming you have a tankless coil in your boiler for domestic water heating or you have a heat exchanger. If you don’t, forget it. You’ll be mixing boiler water with potable water.
If you have a tankless coil in the boiler, go through the tankless coil first, then to the water heater – this way you have a storage tank for the hot water before it goes to the house.
A better way is to add a small circulator to circulate water from the coil to the tank so that it is kept at a constant. You use a secondary thermostat on the tank to cycle the circulator
Absolutely, as long as the water feeding the electric heater is cold. That would be before the domestic hot water.
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You might want to make sure your heater is rated for this. In my instruction sheet it said that mine could be used in conjunction with a heating system. I would contact the manufacturer first before I did anything. Better safe then scalded!
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There should be no problem with the working in tandem. Put a "Y" connection from the cold supply and also a "Y" connection from the heaters going to your home feed in. This will allow the one set hottest to feed first and will always equal out the volume temp. try and set them the same temp as possible.
References :
Yes it can, but you better know what you’re doing.
I’m assuming you have a tankless coil in your boiler for domestic water heating or you have a heat exchanger. If you don’t, forget it. You’ll be mixing boiler water with potable water.
If you have a tankless coil in the boiler, go through the tankless coil first, then to the water heater – this way you have a storage tank for the hot water before it goes to the house.
A better way is to add a small circulator to circulate water from the coil to the tank so that it is kept at a constant. You use a secondary thermostat on the tank to cycle the circulator
References :
29 years HVAC/Mechanical contracting