Hi. We live in an approximately 80 year old brick home a block from the ocean in South Jersey. We have oil heat and have a tight utility room that houses the boiler and hot water heater as well as washer/dryer. There are only 2 people living in the house most of the time, but as many as 8 a few times a year. The house is brick and approximately 2000+ sq. feet. There are 3 1/2 bathrooms.
We want to switch from oil to gas to reduce the monthly bill and so we can get a gas stove. There is no problem getting gas to the house, and we presently have an above ground oil tank after having 2 underground tanks removed. The question is what to get instead of the present setup. We have received 3 quotes. 2 of them proposed a combination boiler/tankless water heater. We like the idea of that because it minimizes how much space the units will take up. One proposed a Bosch combination heat and domestic hot water wall hung high efficiency boiler with a capacity of 151,000 btus and AFUE rating up to 95% for $14,425. The other proposed a Quietside S-Line series with a capacity of 160,000 btus and AFUE rating up to 92% for $12,700. Those quotes included removal of the oil tank and all labor, materials, and permits.
The quote we received today suggested a Weil McLain boiler with 125,000 btus and AFUE rating up to 97% with a separate tankless Rinnai 7.5 gpm for $8,995. This quote came from someone who was not sold on the combo units and did not want us to be a guinea pig. His charge did not include removal of the oil tank.
We want to maximize the space in the utility room so we can add some storage. We do not want to do that at the expense of getting a lousy setup though. What we like about the current setup is that we can have all the showers, the dishwasher, and washing machine going at the same time and still have plenty of hot water. We understand that will not be possible, at least with the combination units. I would appreciate any feedback on the combination units versus separate tankless water heater and boiler. If we did decide to go with the combination unit, any thoughts or experiences with the Bosch versus the Quietside for the proposed prices would be helpful.