I bought an ECO-brand on-demand water heater from the Poulsbo Home Depot between July 14-16 2018. The heater works fine but I have lost my receipt and manual for the water heater. Is it possible to get a copy of the receipt and manual?

You may be able to look up the receipt as long as you didn't pay cash if you pay with a credit card or Home Depot card they can look it up and find the receipt

It's available online from Bosch and energy star. Others most likely....keep the filter clean btw.

You can get the manual online manual.com has most. If you used a credit card or have a pro account customer service can look up your receipt,out of the time.