You can not use the cost of the water heater as a guide to the cost of the installation! Every job is different. With new technology today makes installation two to three times more difficult than in 1960's.
dramatic play - a dramatic work intended for performance by actors on a stage; he wrote several plays but only one was produced on Broadway. drama, play. drama - the literary genre of works intended for the theater. stage direction - an instruction written as part of the script of a play. dramatic composition, dramatic work - a play for performance on the stage or television or in a movie etc.
The difference is that a drama is a type of play. A movie or TV show can also be dramas but are not plays. Some other types of plays are musical, comedy, Shakespearean, and biopic. A play is a dramatic performance, as on stage, and a drama is a composition in prose or verse presenting in dialogue or pantomime a story involving conflict or contrast of character. --Dramas are also intended to be acted out onstage. drama is a type of play.