This work deals with the experimental studies on solar water heater system fitted with seven type of inserts cross type insert; twisted tape insert (i) with three different pitch ratio; (ii) with perforation; (iii) with fins; and (iv) alternative axis with fin. Experiments are carried out both in modified solar water heater and conventional solar water heater for the same operating conditions with Reynolds number ranging from 3000 to 9000. Plain twisted tape with PR = 3 gives better performance than cross type insert and other type of twisted tape due to high whirling effect. Over the range of experimental result, the Nusselt number, friction factor and thermal performance factor of solar water heater fitted with alternative axis of finned twisted tape insert for PR = 3 are respectively 1.43 – 1.2, 1.43 – 1.32, 1.27 – 1.11 times superior than plain twisted tape of PR = 3 due to better mixing flow with fin effect. Also type 7 insert attained average maximum temperature is around 60oC, increases with increase in solar intensity. © Research India Publications.