<html><head></head><body><div class="yahoo-style-wrap" style="font-family:verdana, helvetica, sans-serif;font-size:16px;"><div dir="ltr" data-setdir="false">And can it be used to preheat either domestic hot water or space heat?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks in advance.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">John R Aulbach, PE</div></div></body></html>