That white stuff that looks like mold is actually called effervescence, which is the block sort of disintegrating from the moisture content.

Old houses have cast iron pipers that will disintegrate (because of age and/or foundation shift).

On that project I actually did have to replace part of the sewer too, the old iron pipes had disintegrated but that was the only exception to my staying out of the sewer rule.I've never heard of two inline water heaters but I don't see any reason why it wouldn't work if you have a spare one to use. 

NEW YORK (Reuters) – Renowned investor George Soros said on Friday the world financial system has effectively disintegrated, adding that there is yet no prospect of a near-term resolution to the crisis.The rest of the story:http://news.yahoo.com/s/nm/20090221/bs_nm/us_financial_sorosI guess he doesn't think that Obama can save the world.

You can't get wealthy with it but it might come in handy if the existing currency disintegrates.

I've had claims where roofs have literally started disintegrating from this and this type of damage is something that most insurance policies do not cover.

Old houses have cast iron pipers that will disintegrate (because of age and/or foundation shift).

He said the water has caused his retaining walls to start disintegrating. 

The last identically looking job he went too took considerably more labor and materials - who would have thought the bricks would just disintegrate. 

Also, some older homes will have lead paint and/or asbestos tile or exterior siding (to name a few.)Plumbing can be a nightmare - lead pipes (in some areas) as well as galvanized and iron piping that have disintegrated and will need to be replaced.So have it checked out thoroughly and have a chunk of cash set aside for the "just-in-cases" that can pop up.