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Please check your proof carefully and mark all corrections at the appropriate place in the proof (e.g., by using on-screen annotation in the PDF file) or compile them in a separate list. To ensure fast publication of your paper please return your corrections within 48 hours.For correction or revision of any artwork, please consult http://www.elsevier.com/artworkinstructions.Any queries or remarks that have arisen during the processing of your manuscript are listed below and highlighted by flags in the proof. Location in articleQuery / Remark: Click on the Q link to find the query's location in text Please insert your reply or correction at the corresponding line in the proof Q1The sentence "The stainless steel hot." seems to be incomplete. Please check. Q2Please provide the year of publication.Thank you for your assistance. Highlights< Two domestic scale SWHs with evacuated tube and flat plate collectors (FPCs) were tested under the same conditions. < The annual average collector efficiencies were 46.1% and 60.7% for the flat plate and evacuated tube collectors respectively. < System efficiencies were 37.9% and 50.3% for the flat plate and ETCs respectively. < Simple payback periods (SPPs) varied between 13 years and 48.5 years depending on the type of auxiliary heating system considered. Contents lists available at ScienceDirectEnergy j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / e n e r g y