Is the face plate metal?A. The Grohe 19 614 is made of brass.
Can the Grohe 34 124 Grotherm 3/4 inch thermostatic rough-in valve be enough for the thermostatic valve trim, six body sprays, two shower heads, and 4 volume controls or do I have to also buy a Grohe 29 274 3/4-inch IPS wall mount control volume control rough-in.A. At a standard city 45 pressure per square inch this valve will handle 18 gallons per minute. Your system should have a peak demand of 16-18 gallons per minute. If you are on well water you might consider a pressure pump to increase your PSI to the house.
Separate volume control means... an additional faucet to control the water on/off?A. The Grohe Seabury thermostatic handle would require a volume control such as the 19 828 for each function in the shower (shower head, handshower, or body spray).
What are all the parts needed with the Themostatic Valve and the part number?A. With the Grohe Seabury Thermostatic valve, the first thing you will need is the Rough in for it (part number 34 331 for 1/2" supply lines or 34 124 with 3/4" supply lines. You will also need the Seabury volume control (part number 19 828) with Rough in (part number 29 273 for 1/2" supply or 29 274 for 3/4" supply).
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