[mozart6099]

Guys, I have a boiler with coil for domestic hot water. I'm looking to install a water heater to save on oil in the summer and also the house gets extra hot when the heat runs during the summer. I would like to install it on the second floor because of space available. Should I connect it cold to cold and hot to hot on the opposite side of the tub wall? also leave the boiler lines open during the winter? Thanks for your advice.

 

[jimn]

If your house is getting hot during the summer while providing heat then you have a problem with the boiler. Water should not be circulating through the heating pipes when there is no demand for heat. Usually systems will have a flow check valve in them which will prevent the flow of water through convection when the circulator is not running . You either don't have one or its defective.

As for the water heater , you will probably be much happier with a standalone water heater.

One other thing if your boiler is not designed as a cold start the you will need to keep it running all summer in any event. Letting an older boiler cool down and stay off for an extended invites internal corrosion and leaks between joints.

 

[mozart6099]

If your house is getting hot during the summer while providing heat then you have a problem with the boiler. Water should not be circulating through the heating pipes when there is no demand for heat. Usually systems will have a flow check valve in them which will prevent the flow of water through convection when the circulator is not running . You either don't have one or its defective.

As for the water heater , you will probably be much happier with a standalone water heater.

One other thing if your boiler is not designed as a cold start the you will need to keep it running all summer in any event. Letting an older boiler cool down and stay off for an extended invites internal corrosion and leaks between joints.

Jimn01, thx for the reply. I didn't mean the circulator and baseboards getting hot. The boiler is in the bathroom, I meant a couple degrees in there by just having it running. I just wanna know if I can add the water heater and leave everything else as is.

 

[jimn]

Check with the manufacturer if the boiler can be shut down or post the make and model. There are some plumbers around here who might be able to tell. You will want to some plumbing to bypass the tankless coil in your boiler before plumbing in the water heater .