Rheem RTG20147 3"/5" Horizontal Direct Vent Kit for RTG-53DV Review

We ordered both the water heater and the vent kit.When we got ready to install, we noticed that the water heater nozzle is 3 inches in diameter, and the vent kit nozzle is 2 & 1/4 inches in diameter.Make any sense?No.I contacted Rheem and they advised that there is an adapter for this problem for $34.99.I requested an explanation as to why this was this way...other than the obvious money-making scheme.I have not heard back yet.So I can't actually review if the product works well or not, but I can tell you I was royally po'ed about this adapter thing.

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Product Description:
Rheem RTG20147 3"/5" Horizontal Direct Vent Kit for RTG-53DVAll indoor tankless gas water heaters must be vented vertically or horizontally to the outdoors using Category III stainless steel venting material (No other venting material is permitted). RTG-42PV indoor models require 3" stainless steel venting. RTG-74PV and GT-199PV indoor models require 4" stainless steel venting. NOTE: Rheem outdoor tankless water heaters do not require venting materials.Rheem RTG20147 3"/5" Horizontal Direct Vent Kit for RTG-53DV Features:; (1) Adapter; (1) 90; Elbow; (1) 12" Length Vent Pipe; (1) Horizontal Termination; (1) Pressure Relief Valve; (1) 18-AWG, 2-Conductor Thermostat Wire for Remote Control

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