A hot water heater can produce a rotten egg odor when it is turned on. To determine if the odor is from the hot water heater, go the a sink closest to the water heater and fill a glass with water from the hot water faucet and a second glass from the cold water faucet and smell them.
Typical costs: 1  A cable modem costs $40-$90. For example, Circuit City, an online-only retailer, sells the standalone Motorola SURFboard SB5105 cable modem for $60. 2  Some cable modems are combination devices with routers, which create a wireless network. These devices cost $80-$200. The more expensive units allow for faster rates of transfer. Amazon, for example, sells the Motorola SURFboard SBG900 DOCSIS 2.0 cable modem and router combo for $120.
A wired cable modem router offers the best speeds and the most security, but it has the drawback of being limiting, and in some cases impractical. Unsightly cables might have to be run to different levels of a home or office building.