Friday, Sep 1 338 available FREE Add to Cart or Buy now with Product Details 4 in. Stainless Steel Horizontal Vent Kits are designed to fit the MHU75, HSU75, MHU80 and HSU80 model unit heaters. Designed for vertical installation only. Other select parts may be required for your installation needs.SE and SE+ condensing horizontal termination vent kit. For use with Rinnai super high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustmentShop Mr. Heater Big Maxx 4-in Horizontal Residential Adapter, B-Vent Pipe, Vent Pipe, Elbow, Wall Thimble, Roof Flashing, Storm Collar, Vent Cap at Lowe's.com. New cat III SS sealed 4-in horizontal ducting for unit heaters. Shop Mr. Heater Enerco Horizontal Vent Kit - 4-in - Stainless Steel at Lowe's Canada online store. Find Shop & Garage Heaters at lowest price guarantee.19. Lambro. Rigiflex Outdoor Exhaust Dryer Vent Kit. Model # 1790027. Find My Store. for pricing and availability. 61. IMPERIAL. Indoor Hook-Up Dryer Vent Kit. The Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters is a complete venting kit that includes everything you need for horizontal venting. The kit includes an adapter, b-vent pipe, 2 vent pipes, 90 degree elbow, wall thimble, roof flashing, storm collar, and vent cap.This Item: Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater — 50,000 BTU, LP Conversion Kit, Model# F260550 $499.99 Thermostat For Mr. Heater Garage Heaters $21.99 DuraVent Vent Unit Heater Kit — 4in. Mr Heater Big Maxx Natural Gas Unit Heater With Ng To Lp Conversion Kit 80,00... Sponsored. $757.99. $1,174.47. Free shipping.The Z-Flex 4 Inch Horizontal Vent Kit in stainless steel contains the basic components required to vent a tankless water heater through an outside wall. A back-flow preventer is included for cold climates to help prevent freezing of the water heaters internal piping during cold weather. Includes: 4-in diam. Termination Hood, 4-in diam. x 90 Degree Elbow, 4-in diam. x 1-ft Straight Pipe, 4-in ...Shop 25 mr heater horizontal vent kit at Northern Tool + Equipment. ... DuraVent Vent Unit Heater Kit — 4in. Horizontal, Model# 810006013 Reg. $ 444. 99. Sale ... Category III 4in Stainless Steel Horizontal Vent Kit. $428.59. Add to Wish List. Add to Cart. ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West ...HE and HE+ non-condensing horizontal termination vent kit. For use with Rinnai high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustmentMr. Heater Big Maxx Silver Wall-mounted Garage Heater Vent Kit. The category 1 vertical 4 in vent kit provides class 1 single wall B-vent ducting for Mr. Heater Big Maxx unit heaters, ranging from 50,000, 80,000, and 125,000 BTUs. Complies with US standard (UL441) and Canadian standard (S605). Designed for vertical installation only. This euro-styled design provides a modern take on a traditional pellet stove heater and delivers perfect heating performance while saving you money. The AP5000 wall mounted pellet stove heater has a direct vent design avoiding the typical chimney installs of a traditional pellet stove. Best of all, everything needed is included in the box. TEMPWARE Electric Garage Heater, 7500-Watt Digital Fan-Forced Ceiling Mount Shop Heater with Full-Function Remote, 240-Volt Hardwired Heater with 12-Hour Timer, Ideal for Workshop. 4.5 out of 5 stars. 457. $158.99. $158.99. This item: Mr. Heater MHU125NG NG 125K BTU Unit Heater, Multi. 4.4 out of 5 stars. The Z-Flex 4 Inch Horizontal Vent Kit in stainless steel contains the basic components required to vent a tankless water heater through an outside wall. A back-flow preventer is included for cold climates to help prevent freezing of the water heaters internal piping during cold weather. Includes: 4-in diam. Termination Hood, 4-in diam. x 90 Degree Elbow, 4-in diam. x 1-ft Straight Pipe, 4-in ...SE and SE+ condensing horizontal termination vent kit. For use with Rinnai super high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustment Shop 25 mr heater horizontal vent kit at Northern Tool + Equipment. ... DuraVent Vent Unit Heater Kit — 4in. Horizontal, Model# 810006013 Reg. $ 444. 99. Sale ...Category I 4in Vertical Vent Kit. SKU. F102848. Category I 4in Vertical Vent Kit for use with 50,000-200,000 BTU Unit Heaters. find a distributor. Power exhaust allows for vertical or horizontal venting; Designed for right or left side piping, electrical and flue connections by simply rotating 180° Tubular heat exchanger and spark ignition; 6 Amp draw; Horizontal venting kit, Item# 29794, and vertical venting kit sold separatelyHE and HE+ 12 In non-condensing horizontal termination kit (metal) For use with Rinnai high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustment Shop Mr. Heater Enerco Horizontal Vent Kit - 4-in - Stainless Steel at Lowe's Canada online store. Find Shop & Garage Heaters at lowest price guarantee. Horizontal Unit Heater Vent Material List. Model Number: 6955535 Menards ® SKU: 6955535. Everyday Low Price. $275.94. 11% Mail-In Rebate Good Through 8/27/23. $30.35. Final Price $ 245 59. each.TEMPWARE Electric Garage Heater, 7500-Watt Digital Fan-Forced Ceiling Mount Shop Heater with Full-Function Remote, 240-Volt Hardwired Heater with 12-Hour Timer, Ideal for Workshop. 4.5 out of 5 stars. 457. $158.99. $158.99. This item: Mr. Heater MHU125NG NG 125K BTU Unit Heater, Multi. 4.4 out of 5 stars.Mr. Heater. 30,000 BTU Vent Free Blue Flame Natural Gas Heater. Add to Cart. Compare. Exclusive. More Options Available $ 239. 00 (236) Model# MHC125FAV. Mr. Heater.TEMPWARE Electric Garage Heater, 7500-Watt Digital Fan-Forced Ceiling Mount Shop Heater with Full-Function Remote, 240-Volt Hardwired Heater with 12-Hour Timer, Ideal for Workshop. 4.5 out of 5 stars. 457. $158.99. $158.99. This item: Mr. Heater MHU125NG NG 125K BTU Unit Heater, Multi. 4.4 out of 5 stars. Easily hook up your Mr. Heater Vent Free heater to a bulk propane tank using the Remote Propane Vent Free Installation Kit. The kit features a 2 stage regulator, hand wheel, 12 ft hose assembly, 3/8 in. MP x 3/8 in. MF Fitting, and a 3/8 in. Female thread x 3/8 in. Male Street Elbow.Final Price $ 489 49. each. You Save $60.50 with Mail-In Rebate. Ceiling-mounted forced air unit heater turns garages, barns, and workshops into heated workspaces. 80,000 BTUs heat up to 2,667 sq ft, or approximately a 3 or 4-car garage. Ships as natural gas; includes natural gas to propane conversion kit. View More Information.Shop mr. heater category 3 horizontal 6 in vent kit for big maxx heaters in the pellet stoves section of Lowes.comPay in 4 interest-free installments of $28.75 with. Learn more. Free sitewide shipping over $99*. Low price guarantee*. Safely exhaust your power vented gas-fired heater with our easy-to-use horizontal vent kit. Each kit contains 4 - 2ft. length of vent pipe, a corrosion resistant galvanized steel vent cap, wall thimble.Saf-T Vent® Model EZ Seal/EZ 316 . Single Wall . Gas Vent Connector . Chimney Liner & Special Gas Vent (USA) / Type BH Vent Class I/II (Canada) For Venting Residential, Commercial & Industrial Appliances . Category I, II, III & IV Appliances . 3”-5” Diameter Vent for use on Positive, Neutral and Negative . Pressures up to 9” W.C. Category 1 horizontal 4 in vent kit for use with Mr. Heater Big Maxx or Heatstar by Enerco brand unit heaters ranging from 50,000, 80,000, and 125,000 BTUs. Stainless steel 4 in sealed ducting meets new category 3 certifications, Includes: 4 in x 6-19 in adjustable pipe, 4 in x 12 in vent pipe, 4 in 45-degree elbow, 4 in wall thimble, 4 in ...F299201 - Vent Free Blower Fan Kit ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West 160th St. Cleveland, OH 44135. PHONE: 1 (800) 251-0001. mr. heater university faqs and product data ... vent free. cabinet. forced air propane ... portable oil-fired. portable radiant. dual lp tank hook-up kit. learn more ... mr. heater university faqs and product data ... vent free. cabinet. forced air propane ... portable oil-fired. portable radiant. dual lp tank hook-up kit. learn more ... Shop Mr. Heater 50000-BTU Convection Garage Heater (Natural Gas)undefined at Lowe's.com. The Mr. Heater Big Maxx 50,000 BTU unit heater will turn your garage or barn into a work space you can use all year-round. Uses a built-in high velocityHeatfab is the leading manufacturer of high quality venting systems for special gas vent applications, specified by OEM's for over 20 years. Time-tested installations thoughout North America and globally. Our Saf-T Vent® line of products are perfect for your commercial and industrial needs. ANSI Category I, II, III, and IV appliances: boilers, water heaters and furnaces.FFXWTSF Portable AC Window Vent Kit 5.9” Coupler Adjustable Vertical Horizontal. $29.97. Free shipping. DuraVent Vent Unit Heater Kit — 4in. Horizontal, Model# 810006013 (Q-26) EZ Pro Single Zone 24000-BTU 18 SEER Ductless Mini Split Air Conditioner and Heater with 16-ft Installation Kit. Model # EZPRO-24-HP-23016. Find My Store. for pricing and availability. 2. MRCOOL. DIY Series Dual Zone 27000-BTU 22 SEER Ductless Mini Split Air Conditioner and Heater with 25,25-ft Installation Kit. Jan 19, 2023 · Mr Heater Big Maxx Natural Gas Unit Heater With Ng To Lp Conversion Kit 80,00... Sponsored. $757.99. $1,174.47. Free shipping. Find all Mr. Heater products across all departments at Lowe's. Choose free shipping or pick up in store today!Feb 10, 2020 · 80,000 BTU Natural Gas Unit Heater with LP Conversion Kit and Thermostat SKU: 8547085 Model : F260580 Vertical and horizontal vent kits are also on sale 4 in. Vertical Vent Kit SKU: 8164899 Price $89.97 4 in. Stainless-Steel Horizontal Vent Kit SKU: 8459042 Price $281.97 F299201 - Vent Free Blower Fan Kit ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West 160th St. Cleveland, OH 44135. PHONE: 1 (800) 251-0001. Jun 14, 2023 · NOW. $88.99. Quantity Available: 1. Date Added: 6/14/2023. Location: RACINE. 4" Vertical Exhaust Kit. To purchase this item contact the Plumbing department at the Menards ® RACINE store in person. Questions about this item can be answered by e-mail. Bargain items are NOT available for online purchase. Category III 6in Horizontal Vent Kit. SKU. F102861. Category III 6in Horizontal Vent Kit for use with 50,000-200,000 BTU Unit Heaters. find a distributor.Mr. Heater F299201 Vent-Free Blower Accessory Kit (2016-present), Multi. $382.06. Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters. $149.99. Mr. Heater Vent Free Blower Fan Kit with 12Ft Regulator Accessory Kit Bundle. Add. $83.87. Mr. Heater 12 ft. Remote Propane Installation Kit for Vent Free Units. Category III 6in Horizontal Vent Kit. $709.55. Add to Wish List. Out of stock. Add to Compare. ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West ...Saf-T Vent® Model EZ Seal/EZ 316 . Single Wall . Gas Vent Connector . Chimney Liner & Special Gas Vent (USA) / Type BH Vent Class I/II (Canada) For Venting Residential, Commercial & Industrial Appliances . Category I, II, III & IV Appliances . 3”-5” Diameter Vent for use on Positive, Neutral and Negative . Pressures up to 9” W.C.Buy Mr. Heater F260550 Big Maxx MHU50NG Natural ... Powered exhaust allows for vertical or horizontal venting ... Mr. Heater F299201 Vent-Free Blower Accessory Kit ... Horizontally venting a garage heater is a simple process. First, find the spot on the wall where you want to install the vent. Next, use a level to make sure the vent will be installed level. Then use a drill and hole saw to cut the hole in the wall. Finally, install the vent and attach it to the heater.Sep 4, 2023 · Heatfab is the leading manufacturer of high quality venting systems for special gas vent applications, specified by OEM's for over 20 years. Time-tested installations thoughout North America and globally. Our Saf-T Vent® line of products are perfect for your commercial and industrial needs. ANSI Category I, II, III, and IV appliances: boilers, water heaters and furnaces. Description. The Mr. Heater Big Maxx 50,000 BTU unit heater will turn your garage or barn into a work space you can use all year-round. Uses a built-in high velocity electric fan to pull cool air in and across the heat exchanger, then forces warm, comfortable air out. Its low profile design requires only a 10 ft minimum ceiling height and 1 in ... Mr Heater 4in Stainless Steel Horizontal Vent Kit. SKU# F102860. In Stock (Ships in 3-5 business days) Made In USA. Free Shipping (Ground shipping to lower 48) Low Price Guarantee. $324.99. List: $593.42. (Max. order of 1,000) Jan 19, 2023 · Mr Heater Big Maxx Natural Gas Unit Heater With Ng To Lp Conversion Kit 80,00... Sponsored. $757.99. $1,174.47. Free shipping. Sep 26, 2021 · Find many great new & used options and get the best deals for 4"Vertical Venting Kit Mr. Heater,Big Maxx , Hot Dawg, modine gas heater vent at the best online prices at eBay! Free shipping for many products! Shop Mr. Heater Black Freestanding Installation Kitundefined at Lowe's.com. Easily hook up your Mr. Heater Vent Free heater to a bulk propane tank using the Remote Propane Vent Free Installation Kit. The kit features a 2 stageFinal Price $ 489 49. each. You Save $60.50 with Mail-In Rebate. Ceiling-mounted forced air unit heater turns garages, barns, and workshops into heated workspaces. 80,000 BTUs heat up to 2,667 sq ft, or approximately a 3 or 4-car garage. Ships as natural gas; includes natural gas to propane conversion kit. View More Information.This Item: Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater — 50,000 BTU, LP Conversion Kit, Model# F260550 $499.99 Thermostat For Mr. Heater Garage Heaters $21.99 DuraVent Vent Unit Heater Kit — 4in.4 Horizontal Flue Kit - for HSU/MSU50 and HSU/MHU80 - F102860- 4 Horizontal Vent Kit For use with Mr Skip to Header Skip to Main Content Skip to Footer Call Us 800.472.3292Item # 46677. Model # F202858. Get Pricing and Availability. Use Current Location. Universal ventilation kit for the Mr. Heater Big Maxx garage heater. Adapter included for compatibility with 3" pipe. This item is no longer sold on Lowes.com. Category III 4in Stainless Steel Horizontal Vent Kit. SKU. F102860. Category III 4in Stainless Steel Horizontal Vent Kit for use with 50,000-200,000 BTU Unit Heaters. find a distributor.Shop Mr. Heater 80000-BTU Forced-air Garage Heater (Propane or Natural Gas)undefined at Lowe's.com. The Mr. Heater Big Maxx 80,000 BTU unit heater will turn your garage or barn into a work space you can use all year-round. Uses a built-in high velocityShop mr. heater category 3 horizontal 6 in vent kit for big maxx heaters in the pellet stoves section of Lowes.com 11% Mail-In Rebate Good Through 9/4/23. $47.19. Final Price $ 381 81. each. You Save $47.19 with Mail-In Rebate. Ceiling-mounted forced air unit heater turns garages, barns, and workshops into heated workspaces. 50,000 BTUs heat up to 1,250 sq ft, or approximately a 3-car garage. Ships as natural gas; includes natural gas to propane conversion kit.Saf-T Vent® Model EZ Seal/EZ 316 . Single Wall . Gas Vent Connector . Chimney Liner & Special Gas Vent (USA) / Type BH Vent Class I/II (Canada) For Venting Residential, Commercial & Industrial Appliances . Category I, II, III & IV Appliances . 3”-5” Diameter Vent for use on Positive, Neutral and Negative . Pressures up to 9” W.C.We would like to show you a description here but the site won’t allow us.Description. The Mr. Heater Big Maxx 50,000 BTU unit heater will turn your garage or barn into a work space you can use all year-round. Uses a built-in high velocity electric fan to pull cool air in and across the heat exchanger, then forces warm, comfortable air out. Its low profile design requires only a 10 ft minimum ceiling height and 1 in ... Shop 25 mr heater horizontal vent kit at Northern Tool + Equipment. ... DuraVent Vent Unit Heater Kit — 4in. Horizontal, Model# 810006013 Reg. $ 444. 99. Sale ... The Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters is a complete venting kit that includes everything you need for horizontal venting. The kit includes an adapter, b-vent pipe, 2 vent pipes, 90 degree elbow, wall thimble, roof flashing, storm collar, and vent cap.Shop Mr. Heater Silver Wall-mounted Garage Heater Vent Kit in the Gas Space Heater Accessories department at Lowe's.com. The category 1 vertical 6-in vent kit provides class 1 single wall B-vent ducting for Mr. Heater Big Maxx and Heatstar unit heaters, ranging from 250,000 to4" Horizontal Stainless Steel Z-Vent Wall Hung Water Heater Vent Kit for horizontal installation of Eccotemp 45HI and EL22i Series indoor water heaters.Used to drain condensate from the vent system, high temperature drain tube kit sold separately.Low resistance rain cap is designed to terminate a vertical stack and prevent the entrance of debris or rain in to the vent, it also provides low ...80,000 BTU Natural Gas Unit Heater with LP Conversion Kit and Thermostat SKU: 8547085 Model : F260580 Vertical and horizontal vent kits are also on sale 4 in. Vertical Vent Kit SKU: 8164899 Price $89.97 4 in. Stainless-Steel Horizontal Vent Kit SKU: 8459042 Price $281.9711% Mail-In Rebate Good Through 9/4/23. $47.19. Final Price $ 381 81. each. You Save $47.19 with Mail-In Rebate. Ceiling-mounted forced air unit heater turns garages, barns, and workshops into heated workspaces. 50,000 BTUs heat up to 1,250 sq ft, or approximately a 3-car garage. Ships as natural gas; includes natural gas to propane conversion kit.Power exhaust allows for vertical or horizontal venting; Designed for right or left side piping, electrical and flue connections by simply rotating 180° Tubular heat exchanger and spark ignition; 6 Amp draw; Horizontal venting kit, Item# 29794, and vertical venting kit sold separately HE and HE+ 12 In non-condensing horizontal termination kit (metal) For use with Rinnai high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustmentEasily hook up your Mr. Heater Vent Free heater to a bulk propane tank using the Remote Propane Vent Free Installation Kit. The kit features a 2 stage regulator, hand wheel, 12 ft hose assembly, 3/8 in. MP x 3/8 in. MF Fitting, and a 3/8 in. Female thread x 3/8 in. Male Street Elbow.Join Neighbor's Club. Order Status. Tractor Supply App. Gift Cards. Earn Rewards Faster with a TSC Card! Credit Center. My Pet. Life Out Here Blog. Shop.Category III 6in Horizontal Vent Kit. $709.55. Add to Wish List. Out of stock. Add to Compare. ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West ...
Mr. Heater 30000 BTU Vent Free Radiant 20# Propane Indoor Space Heater (51) ... Mr. Heater F102860 4" Stainless Steel Horizontal Vent Kit for Big Maxx Heaters. . Lowes 00907
mr. heater university faqs and product data ... vent free. cabinet. forced air propane ... portable oil-fired. portable radiant. dual lp tank hook-up kit. learn more ...Shop Mr. Heater at Lowe's Canada online store. Compare products, read reviews & get the best deals! ... Mr. Heater Enerco Vertical Vent Kit - 4-in - Aluminum. Item ... Category III 4in Stainless Steel Horizontal Vent Kit. $428.59. Add to Wish List. Add to Cart. ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West ...Mr. Heater 4 Inch Horizontal Vent Kit for Big Maxx MHU45LP, MHU45NG, MHU75LP and MHU75NG Unit Heaters #F102845 F102845 vent kit Used for horixontal venting on MHU45 heaters Used for horixontal venting on MHU75 heaters Maintains proper clearances through combustible construction May require additional parts to meet local codes The Mr. Heater 4 Horizontal VentDuraVent Gray 3-in pellet vent kit. Kit includes: round horizontal cap, 90° elbow, wall strap, five 12” pipe lengths, tee with clean-out tee cap, wall thimble, appliance adapter. 4” kit includes a 3”-4” appliance adapter/increaser. F299201 - Vent Free Blower Fan Kit ... COPYRIGHT MR. HEATER 2020. Enerco Group Inc / Mr. Heater 4560 West 160th St. Cleveland, OH 44135. PHONE: 1 (800) 251-0001. Final Price $ 489 49. each. You Save $60.50 with Mail-In Rebate. Ceiling-mounted forced air unit heater turns garages, barns, and workshops into heated workspaces. 80,000 BTUs heat up to 2,667 sq ft, or approximately a 3 or 4-car garage. Ships as natural gas; includes natural gas to propane conversion kit. View More Information.HE and HE+ 12 In non-condensing horizontal termination kit (metal) For use with Rinnai high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustmentFFXWTSF Portable AC Window Vent Kit 5.9” Coupler Adjustable Vertical Horizontal. $29.97. Free shipping. DuraVent Vent Unit Heater Kit — 4in. Horizontal, Model# 810006013 (Q-26)EZ Pro Single Zone 24000-BTU 18 SEER Ductless Mini Split Air Conditioner and Heater with 16-ft Installation Kit. Model # EZPRO-24-HP-23016. Find My Store. for pricing and availability. 2. MRCOOL. DIY Series Dual Zone 27000-BTU 22 SEER Ductless Mini Split Air Conditioner and Heater with 25,25-ft Installation Kit. Jun 14, 2023 · NOW. $89.99. Quantity Available: 1. Date Added: 6/14/2023. Location: RACINE. Vertical Exhaust kit for a Big Maxx garage heater. To purchase this item contact the Plumbing department at the Menards ® RACINE store in person. Questions about this item can be answered by e-mail. Pay in 4 interest-free installments of $28.75 with. Learn more. Free sitewide shipping over $99*. Low price guarantee*. Safely exhaust your power vented gas-fired heater with our easy-to-use horizontal vent kit. Each kit contains 4 - 2ft. length of vent pipe, a corrosion resistant galvanized steel vent cap, wall thimble. Final Price $ 489 49. each. You Save $60.50 with Mail-In Rebate. Ceiling-mounted forced air unit heater turns garages, barns, and workshops into heated workspaces. 80,000 BTUs heat up to 2,667 sq ft, or approximately a 3 or 4-car garage. Ships as natural gas; includes natural gas to propane conversion kit. View More Information.Sep 4, 2023 · Heatfab is the leading manufacturer of high quality venting systems for special gas vent applications, specified by OEM's for over 20 years. Time-tested installations thoughout North America and globally. Our Saf-T Vent® line of products are perfect for your commercial and industrial needs. ANSI Category I, II, III, and IV appliances: boilers, water heaters and furnaces. Purchase. per foot slope of horizontal run of vent pipe. Joining the sections are simple, which is how this got up to 2 stars. When you want to buy a garage heater, there are several features to look out for.. Mr. Heater 4 inch Stainless Steel Horizontal Vent Kit for Big Maxx MHU50 and MHU80 Unit Heaters From the Manufacturer. SE and SE+ condensing horizontal termination vent kit. For use with Rinnai super high efficiency Tankless water heaters. Concentric venting reduces install time and costs, allows for secure connection and ease of assembly/adjustmentShop Mr. Heater 50000-BTU Convection Garage Heater (Natural Gas)undefined at Lowe's.com. The Mr. Heater Big Maxx 50,000 BTU unit heater will turn your garage or barn into a work space you can use all year-round. Uses a built-in high velocity.