Step 1: Identify Whether You Need Hot or Filtered Cold
Moen offers both instant hot dispensers (S5520SRS, 8714SRS) and cold filtered faucets (7402SRS Sip Series). If you want near-boiling water for tea and cooking, you need the S5520SRS or 8714SRS with the under-sink tank. If you want a separate filtered cold-water tap, you need the 7402SRS paired with a compatible under-sink filter. These are two entirely different product lines -- confirm your application before selecting a model number.
Step 2: Choose Faucet Style Based on Kitchen Design
Moen instant hot faucets come in contemporary (S5520SRS straight body) and traditional (8714SRS Georgene arched spout) styling. If your kitchen features Moen Align, Arbor, or Motionsense faucets in a modern aesthetic, the S5520SRS straight body matches. If you have a Moen Brantford, Georgene, or Weymouth main faucet in a transitional or traditional kitchen, the 8714SRS mirrors those design lines. Both units use identical tank and heating assemblies -- the faucet body is the only difference.
Step 3: Assess Tank Capacity vs. Household Demand
Moen instant hot tanks hold 1/3 gallon (approximately 40 fluid ounces). This delivers roughly 40 cups of near-boiling water before the tank must reheat. Recovery time is 10-15 minutes. A household of 2-3 people making 4-6 cups of tea or instant beverages daily will never deplete the tank. Households of 5-6 heavy users or homes where the dispenser serves as the primary hot water source for a home office should evaluate the Kohler K-6665 (0.4 gallon) or InSinkErator H770 (0.5 gallon) for larger tank capacity.
Step 4: Verify Under-Sink Electrical Access
Moen instant hot tanks require a 120V 15A outlet, ideally GFCI-protected, within 3 feet of the tank installation point. The power cord is not included with the S5520SRS -- you provide a standard 3-prong cord or have an electrician install a dedicated outlet. Measure the distance from your nearest under-sink outlet to the tank mounting position before ordering. Running an extension cord is not recommended for a 1500W continuous-use appliance.
Step 5: Budget All-In Cost Including Installation
Moen S5520SRS street price is typically $200-260 depending on retailer. Add $80-150 for a braided stainless supply line and mounting hardware if not included. Professional plumber installation adds $100-200 depending on market. Total installed cost is approximately $400-600, comparable to Kohler and InSinkErator at the same tier. The Moen Lifetime Limited Warranty covers the faucet body and tank against defects for the original purchaser.