Manuals for Iheat Tankless Electric Water Heaters Model Document AHS18-D Product Brochure , Warranty , Instructions / Assembly , Use and Care Manual AHS24-D Instructions / Assembly , Use and Care Manual , Product Brochure , Warranty AHS27-D Instructions / Assembly , Use and Care Manual , Warranty S-12 Instructions / Assembly , Use and Care Manual , Warranty , Product Brochure S-14 Warranty , Instructions / Assembly , Product Brochure , Use and Care Manual S-16 Instructions / Assembly , Use and Care Manual , Product Brochure , Installation Guide , Warranty S-7 Warranty , Product Brochure , Instructions / Assembly , Use and Care Manual