Heat Pumps & Tankless Water Heaters

Author: Pacific Northwest Inspections Group, LLC   Date: 26-Mar-2017.   Category: Plumbing   Add to Favorites 

 

Tankless Water Heaters

When the burner in a tankless water heater fires up to heat water, there's a small amount of scale that can happen. Scale occurs when heat separates the dissolved minerals in water. The harder the water in your area, the more this happens, and these minerals will build-up on the unit's heat exchangers. Left unchecked, this scale can lower the water heater's efficiency and even reduce the life-span of the unit.

There is a simple maintenance routine, which I explain in the video below, that should be done periodically - once a year if the unit is used frequently. It's a straight-forward procedure to clean your tankless water heater and remove scale, and it works regardless of the unit’s manufacturer. Tankless units from Rinnai, Takagi, Rheem, Noritz, Bosch, and others can all be cleaned using this method, provided the unit was installed with flush valves to begin with. If it wasn't, call the plumber back and get those installed, then watch this video.

 

Do you need to Add on a Tank to a Tankless water heater ?

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Tankless Water Heater Tankless Water Heater (444 KB) 


Heat Pump Water & Tank Water Heaters

Heaters Heat pump water heaters use electricity to move heat from one place to another instead of generating heat directly. Therefore, they can be two to three times more energy efficient than conventional electric resistance water heaters. To move the heat, heat pumps work like a refrigerator in reverse.

Heat pump water heaters use electricity to move heat from one place to another instead of generating heat directly. Therefore, they can be two to three times more energy efficient than conventional electric resistance water heaters. To move the heat, heat pumps work like a refrigerator in reverse.

While a refrigerator pulls heat from inside a box and dumps it into the surrounding room, a stand-alone air-source heat pump water heater pulls heat from the surrounding air and dumps it -- at a higher temperature -- into a tank to heat water. You can purchase a stand-alone heat pump water heating system as an integrated unit with a built-in water storage tank and back-up resistance heating elements. You can also retrofit a heat pump to work with an existing conventional storage water heater.

Heat pump water heaters require installation in locations that remain in the 40º–90ºF (4.4º–32.2ºC) range year-round and provide at least 1,000 cubic feet (28.3 cubic meters) of air space around the water heater. Cool exhaust air can be exhausted to the room or outdoors. Install them in a space with excess heat, such as a furnace room. Heat pump water heaters will not operate efficiently in a cold space. They tend to cool the spaces they are in. You can also install an air-source heat pump system that combines heating, cooling, and water heating. These combination systems pull their heat indoors from the outdoor air in the winter and from the indoor air in the summer. Because they remove heat from the air, any type of air-source heat pump system works more efficiently in a warm climate.


 

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