Architecture even today stands on use of solids only. These materials are practical in many ways, but there are some properties in which they much less effective.
A conventional house shall stand and assure ideal thermal conditions. The problem with solids is that they are much better in the first then in the second. A house can have light construction, but then good indoor climate is compromised: for perfect thermal comfort air and surrounding surfaces need ideal temperature, but without thermal mass that cannot be assured.
This is because the problem is with the model, not with the structure, and the way we build. Having a classical house is like have a cup with a hole and trying to keep the water inside with making the hole smaller. But this only slows the process.
Water House works just like planet Earth. Solid, fluid and gas work together and all serve the purpose they are best in. Air insulates, soil gives geometry and water provides thermal storage and distribution.
Water House works exactly the same way. Our buildings have only Mass and Insulation today. This helps to protect indoor climate to certain extent, but the process is slow: some parts of our buildings can be too hot and others cold the same time because the lack of connection between them.
Water House is not simply an improvement of classic model, it is a completely new type of structure. Fluid infill is not only a superb heat storage opportunity, it is also perfect for heating and cooling, and also distributing to maintain an ideal thermal balance indoors.