ELECTRICAL HEATING APPARATUS

1. Electrical heating apparatus for automatically heating water passing therethrough from a cold water supply pipe to a hot water delivery pipe, comprising: a housing including an electrical heater therein, an inlet conduit and an outlet conduit; an electrical control device controlling said electrical heater; an inlet conduit connectable between the water supply pipe and the electrical heater for inletting cold water to the electrical heater; an outlet conduit connectable between the electrical heater and the water delivery pipe for outletting hot water thereto from the electrical heater; and a pressure-responsive device cooperable with said electrical control device to control the electrical heater; characterized in that said pressure-responsive device is connectable to one of said conduits being parallel to the electrical heater housing an that said pressure-responsive device comprises an inlet opening integrally formed with said one conduit and corresponding coupling of the electrical heater housing. 2. The apparatus according to Claim1, wherein said one conduit integrally formed with said pressure-responsive inlet is the inlet conduit connectable between the water supply pipe and the electrical heater for inletting cold water to the electrical heater. 3. The apparatus according to Claim 2, wherein said inlet conduit is also integrally formed with said heater coupling. 4. The apparatus according to Claim 1, wherein the apparatus further comprises: a control valve for controlling the water flow through said electrical heater; said control valve including a housing having an inlet also integrally formed with said one conduit and with at least part of said control valve housing. 5. The apparatus according to Claim 4, wherein said control valve is a manually presettable valve. 6. The apparatus according to Claim 5, wherein said manually presettable valve is a ball valve having a ball rotatable within the control valve housing and formed with a groove selectively positionable within a passageway for controlling the water flow therethrough and through the electrical heater. 7. The apparatus according to Claim 4, wherein said control valve is a regulator valve automatically regulating the water flow therethrough to have a relatively constant flow rate despite variations in the water inlet pressure. 8. The apparatus according to Claim 7, wherein said regulator valve comprises a membrane deformable in a flow control passageway in response to water flow through