2 heat system convert to 1

ALH_4

If the steam boiler is large enough for both loads, you could keep the steam system (since the steam boiler is relatively new) and add a dual-coil indirect water heater so that the lower coil would be the input to the domestic hot water, and the baseboard heating system would pull from the upper coil. You would also need to add a tempering valve for the domestic hot water.

That way you accomplish adding an indirect water heater and keeping the baseboard heating system fluid separated from the steam system and at higher pressure. You would need to add only one bronze or stainless circulator to circulate through the lower coil of the tank to heat the domestic hot water. I would recommend a Crown Megastor 79gal dual-coil tank for this purpose.

Chagit

2 boiler system

Hi,

We just recently bought an 1900 sq. foot house built in 1940 that has 2 gas heating systems. Part of the house is heated by a 105,000 BTU Burnham steam boiler/radiators that was installed a few years ago. There is also an approximately 23 year old forced hot water boiler with 4 zones going to the the part of the house that was an addition (built in the 80's) and baseboard heat. We had an energy audit that told us that the older boiler was emitting 250 ppm of carbon monoxide through the flue (should be less than 100) and upon consulting with a heating plumber were told that we need to get rid of the old boiler. We were given 2 options:
1. Ideally we would get rid of the 2 boiler system and get one more efficient system that would also heat the hot water indirectly (a Bederas 99% efficient boiler). This could be done by getting all hot water baseboard (replacing the radiators) but would be very costly.
2. Keep the steam boiler as it is relatively new and get an EverHot system that would convert the steam to a temperature that could still go through the 4 zone hot water pipes but would allow us to get rid of the old boiler that is producing too much CO.
My question is has anyone ever heard of the EverHot system to do this kind of conversion? Do you have other suggestions/recommendations. The second option would be less expensive than the first. We definitely want to get the CO problem resolved, partially for health/safety reasons and also so we can get a contract to add more insulation to our walls (they won't sign it now due to the CO levels being elevated) and to get a more efficient system (save money on gas and be better for the environment).