How to Install a Combination Boiler/Water Heater | Ask This Old House
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This Old House plumbing and heating expert Richard Trethewey replaces a water heater and boiler with a single unit that’s much more efficient. (See below for a shopping list, tools, and steps.)
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Shopping List for How to Install a Combination Boiler/Water Heater:
– Plywood panel, used for mounting new combination boiler[BR]
– Combination boiler/water heater, including mounting hardware
– PVC pipe and fittings
– Outdoor temperature sensor
– PVC condensate line with limestone neutralizer
– Condensate pump
Tools List for How to Install a Combination Boiler/Water Heater:
– Screwdriver
– Drill/driver with 4-inch hole saw
– Tape measure
Steps for How to Install a Combination Boiler/Water Heater:
1. Mount a plywood panel to the basement wall to serve as a mounting panel for the new combination boiler.
2. Run new gas, electrical, and plumbing lines to the plywood panel.
3. Screw the metal mounting brackets to the plywood panel, then hang the combination heater onto the brackets.
4. Drill two 4-inch-diameter holes through the house wall for the exhaust vent and air intake vent. Be sure the air intake is above the snow line, and that the exhaust vent is 12 inches from a window and 12 inches from the air intake.
5. Use PVC pipe and fittings to create the exhaust and air intake vents. Run the piping from the boiler through the exterior wall.
6. Connect hot- and cold-water lines to the combination boiler to deliver water to the heating system and the domestic water fixtures.
7. Connect the gas line and new electrical cable to the combination boiler.
8. Mount an outdoor temperature sensor onto the north side of the house to help regulate the production of hot water.
9. Run a PVC condensate line with limestone neutralizer from the combination heater to a nearby utility sink drain or floor drain. Use a condensate pump to drain away the excess condensation.
10. Turn on the combination boiler, and it should immediately start making hot water.
11. Remove and discard the old boiler and water heater.
About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.
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How to Install a Combination Boiler/Water Heater | Ask This Old House
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Of course in winter you will certainly notice that youre getting enough heat in the house if its 10 -15 minutes thats long enough
as small a combi as this is. There are times when the heat call is still smaller than the combi will produce. So this is a great reason to keep the old tank water heater as a ballast tank with enough warmed water to supply the radiant without short cycling the combi. This seems to happen most often with using radiant heating as opposed to the convectors which usually have a much larger btu heat call. Radiant floor (could be in the wall or ceiling) spread the heat load and will have cooler water flowing than the convectors
hello i´m from south of brasil, and we used this wather heater a lot of time, we never used a boiler, we used a gás passager. He just work wen you open the shower, when you closed he stop whith a gás…. This way we can saver money!
9:08 I take really long showers LOL
I’ve got a combi boiler that sits outside. Trouble is mice decided to use it to nest in. There’s no visible gaps but they still got in. It stinks when you open it.
USE A PANCAKE TERMINATION! Looks so much better than seperate or concentric IMO
Anyone own one of these?
How come you did not use a low profile termination kit on the side of the house for the vents? Something like Rheem Horizontal Vent Termination Kit, or the IPEX Plastic Side Wall Vent Kit, or Trane BayVent?
Have you ever thought of replacing all those old rusty boilers? If yes you should go for tankless water heaters, here is a good guide which one to choose from https://www.tanklesswaterheater.org