Hot water is an amenity that most people just can't live without. Gas Hot Water Heater Venting Problems Now that I have a high efficiency furnace it seems I no longer need such a large vent since only the hot water heater uses it. Conventional tank water heaters generally utilize two types of vent and vent connectors: B-vent and single-wall. If the exhaust pipe is 4 inches in diameter, the flue liner cross sectional area should not be larger than 88 square inches. Temperature: The temperature of the piping between the water heater and the location of the water fixture is another factor that may impact hot water delivery. This is usually seen as the electric backup heater for the hot water cylinder. When installing a gas water heater, building codes requires that they be ventilated out of the room, through the attic, and out through the roof. PVC vent pipes can be used only with water heater power vent /exhaust motor equipped hot water heaters also known as an induced draft gas water heaters. Do not cut the vent collar of the unit. blockages prior to connecting it to the water heater or boiler unit. How can I check the TRP valve myself in case of hot water heater leaking from overflow pipe? But B-vent and single-wall are not the same. Item #859043. You want it to be of the right size for your heater, and you want to use materials that won’t get too hot or start a fire. Most have a “natural-draft” type of vent, where the hot waste gases rise through an open draft diverter and into metal pipes, which eventually lead to the outdoors. While in the attic I found that the gas water heater was not properly vented, so now that heater is turned off. If it blows back at you, you have a venting problem. • Can you use a light switch for a water heater disconnect? Navien NPE series condensing tankless water heaters deliver an endless supply of hot water for any size home. Because the new vent pipe is smaller, it can often be installed inside the old vent pipe. For more general inquiries about water heaters, you may want to check out this Wikipedia page. A water heater vent pipe can be used for this venting with a hot water heater vent cap for safety reasons. Compare; Find My Store. The difference is that a power vent water heater pulls in combustion air from the space around the appliance, then uses a fan to propel the exhaust through the vent. The next concern is the cost. 3. In the event of overheat the pipe will drip safely into the cold water feed tank. Tankless water heaters are vented in two ways: direct vent and power vent. Image Source: Dreamstime 40163150. Gas water heaters need proper venting for operation. We cannot discharge the T&P valve into the pan. Vents exceeding 40 feet (12 192 mm) in developed length shall be increased by one nominal pipe size for the entire developed length of the vent pipe. The cold water comes in and hot water goes out. Compare; Find My Store. Older water heaters typically use a vent pipe called Type B. 3. The vent must be easily removable from the top of the water heater for normal service and inspection of the unit. The critical thing to keep in mind is you want a safe venting system. In commercial and industrial applications, our outstanding recovery capabilities make Bock water heaters ideal for everything from light demand to high demand/continuous-use requirements. the pressure in the pipes of hot water heater overflow leaking, and prevent them from the damage or leak. This configuration allows tankless units to fit in smaller spaces; in fact, tankless water heaters save up to 16 square feet of space. If the draft hood that came with your water heater has a top opening diameter designed for 3 vent pipe and you have 4 vent pipe installed use an adapter increaser. On any horizontal sections of vent, make sure the pipe slopes down toward the water heater 1/4 in. I figure to end up replacing the unit fairly soon. Climate, weather, seasonal changes and the path of the hot water pipe can all have an impact. 5 Vent pipe leading back to cold water tank; 6 Hot pipe to feed taps; 7 Cold feed out; 8 Hot from boiler; Indirect Cylinder. Advantages: can be installed to increase the pressure of header tank supplied hot water cylinders, better pressure there fore better showers and quicker hot water delivery times. High Efficiency tankless water heaters will either need a Category III stainless steel vent or PVC, depending on the manufacture’s recommendations. They also operate more quietly than their power-venting counterparts. 1 Drain Cock; 2 Incoming cold feed; 3 Return to boiler ; 4 Flow from boiler; 5 Heat exchanger; 6 Immersion; 7 Hot feed to taps; 8 Vent pipe; In the majority of houses in this country, there are two different types of hot water system. Make sure that the ventilation direct outside the house, or … Then, hold an extinguished match near the vent hood. 2. This is because most homes have water heaters and furnace sharing the same exhaust vent. How long the vent pipe is. Hot water heater vent pipe size. How? The most important pipe on the system and the reason it is open vented. • How can I tell if a water heater is HUD-approved for mobile/manufactured homes? Typically, if the existing vent (that served both furnace & water heater) is larger than 4 inches, so a smaller vent pipe must be installed for only the water heater. Bock water heaters and storage tanks are perfect for all residential applications, particularly those with high-volume hot water demands. Do not weld the vent pipe to the water heater’s vent collar. Compared to atmospheric, direct-vent water heaters offer more installation flexibility because they can vent horizontally. Most water heaters have 3" vent pipe. per foot of pipe. Bend out small sections of the pipe and attach it directly to the vent hood with screws (Photo 6). You can do this yourself if you have a helper to assist with removing the old heater and placing the new one, and running your vent pipe. The previous owner was a little old widow woman who had a 30 gallon heater installed nine years ago. when the pressure increases in the cylinder due to thermal expansion only cold water will be vented. Measure the diameter of the exhaust pipe leaving your hot water heater. Model #223176PP. Item #859081. In order to do this, two critical measurements must be taken: one on the ceiling above the water heater and one that is the distance from the attic floor to the roof. There is an 18 " straight run ( no joints) up into the attic, and straight up through the roof; very simple layout. Any water being heated up can expand up this pipe. Make sure the tank is completely full and the hot water lines in the house have all been purged for air pockets prior to lighting the new tank. Rinnai Tankless Gas 5-in Steel Water Heater Vent Kit. You want an airtight seal from the heater flange to the ductwork to the exterior hole. You can do a quick check of your chimney to see if it meets an old rule of thumb and some of the current codes. The common vent system covered in this manual is approved only for direct venting applications. You cannot reduce the vent pipe so getting a new heater with a larger vent is a problem. Avoid using an oversized vent pipe or using extremely long runs of the pipe. Rinnai Tankless Gas 5-in Plastic Water Heater Vent Kit. The first step that you need to do for checking hot water heater leakage is to check TRP valve. Yesterday I started to install new roof vents. ... • Is the minimum size water heater inlet pipe 1/2" or 3/4" according to the building code? The smoke should pull into the hood. Horizontal vent pipe runs must be supported every 4 feet (1.2 m) (minimum). However, the key here is to install the vent pipe in the size required by the water heater. Our previous water heater had a 1" copper pipe from the T&P valve and a 1" copper pipe from the drain pan that tied together to a 1" copper pipe that drained to the outside. Model #223188. I live in Southern California and am almost positive that tying the two together is a no go especially since the pipe diameter is the same size as the two incoming pipes. The following information may also apply to CPVC and ABS pipes if such installations are permitted by … Direct-vent units pull in air from outside the home or building and have two vents, one for intake and one for exhaust. These vents get hot by design—a hot vent is part of what produces the draft required to remove the combustion products from the building. Water Heater size (in gallons). Not sure if this is your problem? I think the furnace installers inserted a chimney liner to reduce the draw. If it is a 3-inch-diameter pipe, the inside cross sectional area of the chimney flue liner should not exceed 49 square inches. In case of hot water heater leaking from overflow pipe, you must take an action immediately. Yes, venting tankless water heater with furnace is possible. Immersion Heater. 906.3 Developed Length. Another consideration would be the vent pipe. Rinnai Tankless Water Heaters are designed to provide maximum performance and efficiency using either a 3/4" or 1/2" gas line, as long as sufficient gas flow is available. This type of venting system is different from what you see on most gas water heaters. Type B is made out of galvanized or aluminum. Compare; Find My Store. It’s easier to run the vent if you install a “power-vented” type of natural gas (or propane) water heater. Relief vents for soil and waste stacks in buildings having more than 10 branch intervals shall be sized in accordance with Section 908.2. for pricing and availability. Can it be cut? Model #224255. Most plumbing codes require a minimum of three screws for each vent pipe joint. To learn more about them see our blog posts What is the difference between a regular water heater and a direct vent water heater? Gas hot water heaters can range in cost from around $300 on up to $2,000 for a high efficiency model. The water heater vent must not be connected to any other gas appliance or vent stack. I recently bought a older house. While aluminum will not rust it will corrode when exposed to acidic condensation. I need to remove 5". It is the sole responsibility of the system designer to select the correct products needed for the specific application. At the top of your hot water heater you have an inlet and an outlet pipe. An undersized gas line can stress a tankless system and possibly reduce its lifespan, all Rinnai tankless water heaters are equipped with technology that safely ceases operation if they detect an inadequate gas flow. for pricing and availability. To check the venting on your existing unit, close all windows and doors and turn on all gas appliances and exhaust fans and turn up the temperature on your water heater for a few minutes. Pro-Size is intended to assist in selecting water heaters or boilers that best meet the specific job requirements. Vent pipes shall not be less than 1 1 / 4 inches (32 mm) in diameter. New gas hot water heater is 5" taller than old (of course the same size would be too easy).Flex water and gas lines -no problem; but the class B ( double wall ) exhaust vent is ? Check your pipe fittings with liquid dish soap to insure no gas leaks. Item #672881. Rinnai Tankless Gas 90 5-in Steel Water Heater Vent Kit. A leaking hot water heater can result from leaks in the pipes. There is usually an union on each one that allows for the removal of the hot water tank. Vent Pipe (open) HWC Water Head Hot Taps Pressure Reducing Valve Filter / Stop Cock Cold Supply Mains. Then continue installing new vent pipe sections and connect to the flue. All vertical vent pipe runs must be supported every 6 feet (1.8 m) (minimum). Disclaimer: The A. O. Smith Pro-Size sizing program is a tool that can be used to estimate water heater requirements for many common applications. For example, the A. O. Smith 50-gallon ProLine Power Vent Water Heater (available from SupplyHouse) has an FHR of 90 gallons, so it will provide up to 90 gallons of hot water in an hour. water heater vent sizing? Expansion Pipe/Vent pipe.