Tankless water heater plumbing diagram

What is the downside of a tankless water heater?

The primary disadvantage of on demand or instant hot water heaters is the upfront cost. The smaller units that you often see won’t produce enough hot water to serve most households. They’ll only serve one faucet at a time—a problem if you want to shower while the dishwasher is running.

Can I add a tankless water heater to existing system?

One solution that is often recommended by plumbers is the installation of an electric tankless water heater booster which can fit right onto your existing gas or electric tank -style water heater or be mounted nearby on a wall.

Can you connect PEX to tankless water heater?

PEX can ‘t be directly connected to a water heater .

What size breaker do I need for a tankless water heater?

Electrical Requirements

Model Recommended Breaker Recommended Minimum Wire Gauge
ECO 18 2 x 40 Amps DP 2x #8 AWG
ECO 11 1 x 60 Amps DP 1x #6 AWG
ECO 8 1 x 40 Amps DP 1x #8 AWG
POU 6 1 x 30 Amps 1x #10 AWG

Can you run out of hot water with a tankless water heater?

Although a tankless system can ‘t run out of hot water , it can be overwhelmed with demand. If more than one tap is on-demand hot water at the same time, however, such as other showers or a running washing machine, the water heater will struggle to keep up and drain extra power.

What size tankless water heater do I need for a family of 5?

In short, a family of 5 would need a 10 GPM gas tankless heater or 27 kW electric tankless heater if you live in the northern part of the USA where the input water has a lower temperature. There the tankless heater has to work extra hard to bring the water temperature up to 110˚F or 120˚F.

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How long will a tankless water heater last?

20 years

What are the pros and cons of tankless hot water heaters?

Are Tankless Water Heaters Worth It? 10 Pros and Cons Pro #1: Instant Hot Water. Con #1: Inconsistent Temperatures. Pro #2: Longer Lifespan. Con #2: Higher Initial Cost. Pro #3: Lower Month-to-Month Costs . Con #3: Limited Hot Water Supply. Pro #4: Space Savings . Con #4: Additional Equipment is Often Necessary.

What size tankless water heater do I need for a family of 4?

Sizing Guide for Residential Tankless Water heater
Household Occupants Usage Capacity Required (Measured in Gallon)
2-3 people High 40-50
3- 4 people Regular/Low 40
High 50-75

Why are tankless water heaters so expensive to install?

In general, purchasing and installing a tankless water heater costs about 2 to 2.5 times as much as a standard water heater because of the higher production costs of the unit, venting, and resizing the gas line and gas meter required to support the unit’s demand.

Is Blue PEX OK for hot water?

Blue PEX pipe carries cold water . White PEX pipe can be used for either hot or cold water . Gray PEX pipe, like white, can be used for either hot or cold water (although not all DIY centers carry gray). There would be no problem, for example, using blue PEX for hot water lines or red PEX for cold water lines.

Where is PEX not allowed?

Pex not being allowed in commercial or industrial buildings, and thus not in residential buildings deemed “commercial industrial”.

Can SharkBite fittings be used on a hot water heating system?

Yes. SharkBite fittings can be used for hydronic heating applications if the temperature does not exceed 200°F.