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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

a b s t r a c tThis paper presents a validated TRNSYS model for forced circulation solar water heating systems used in temperate climates. The systems consist of two flat plate collectors (FPC) and a heat pipe evacuated tube collector (ETC) as well as identical auxiliary components. The systems were fitted with an automated unit that controlled the immersion heaters and hot water demand profile to mimic hot water usage in a typical European domestic dwelling. The main component of the TRNSYS model was the Type 73 FPC or Type 538 ETC. A comparison of modelled and measured data resulted in percentage mean absolute errors for collector outlet temperature, heat collected by the collectors and heat delivered to the load of 16.9%, 14.1% and 6.9% for the FPC system and 18.4%, 16.8% and 7.6% for the ETC system respectively. The model underestimated the collector outlet fluid temperature by À9.6% and overestimated the heat collected and heat delivered to load by 7.6% and 6.9% for the FPC system. The model overestimated all three parameters by 13.7%, 12.4% and 7.6% for the ETC system. Q1