The initial cost of this type of heater may be lower than the cost of installing a radiant heating system. However, this may be both a plus and a minus and will depend on several factors including the size of the room that needs heating and the type of boiler you choose. When compared to an electric heater, the initial costs of an HWB heater are higher, especially if you don't have a boiler and the space you have to heat up is large. However, in the long run, the investment is well worth it because you will save on the electricity bills.
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First, they need to logically fit together. A user should expect items of these various types to be grouped together (or at least wouldn't be surprised that they have been grouped together). And in terms of design, they should have some common intersection of list type and fields. Combining Documents, Discussions, and Events into a single list wouldn't be a good idea. Likewise, I'm not sure Posts and Comments (as you mention above) would be a good fit for a single list. They just don't logically fit and their schemas probably do not have enough in common.