On Dec 22, 9:49�am, wrote:
On Tue, 22 Dec 2009 09:39:21 -0500, "Ray"

wrote:
Recently I read somewhere that it's possible to add an auxiliary tank to
supply water heaters.

The purpose is, water comes from underground into a storage tank, where the
temperature of the water is raised by ordinary basement temperatures -- �
especially in furnace rooms.

This water then feeds water into the heating tank at a considerably higher
temperature, thereby saving energy costs.

This is common sense. Is this technology available now?

It's called a tempering tank.

It doesn't make quite as much sense as it appears in most cases.

any uninsulated tank will do this, but you wouldnt gain much. it will
use the heat of your basement, so you have to heat the space more.

so whats the OPs situation?

hot water not hot enough? having a tankless issue with incoming too
cold water? you want endless hot water? or some other more obscure
problem?