Skip to content
LearnMetrics
  • Home
  • General HVAC
    • ACH Calculator
    • EER To SEER Converter
    • SEER to EER Converter
    • EER To COP And COP To EER Converter
    • Coefficient Of Performance (COP)
    • CADR Rating
    • AFUE Rating For Furnaces
    • Understanding EER Rating
    • EER Chart For AC Units
    • SEER Rating
      • 16 SEER vs 14 SEER
    • HSPF Rating
    • MERV Rating
    • Watts To Amps Converter
    • Convert kW To Amps
    • BTU To kW Converter
    • BTU to Ton
    • Convert kVA To Amps
    • Wire Gauge Chart
  • Heating
    • Best Tankless Water Heaters
    • Best Tankless Gas Water Heaters
    • Best Electric Tankless Water Heaters
    • Best Garage Heaters
    • Best Space Heaters For Large Rooms
    • Best Pellet Stoves
    • Best Electric Fireplaces
    • Best Baseboard Heaters
    • Best Ventless Propane Heaters
    • Electric Furnace
    • Oil Furnace
    • Gas Furnace
  • Air Conditioning
    • Best Ductless Mini Split AC Units
      • Mr COOL DIY Mini Split Review
      • Best Dual Zone Mini Split Systems
      • Best 3 Zone Mini Split Systems
      • Best 4 Zone Mini Split Systems
      • Best 5 Zone Mini Split Systems
    • Best Mini Split Heat Pumps
    • Smallest AC Units
    • Types Of Air Conditioners
      • Best Through-The-Wall Air Conditioners
      • Best 5,000 BTU Air Conditioners
      • Best 8,000 BTU Air Conditioners
      • Best 10,000 BTU Air Conditioners
      • Best 12,000 BTU Air Conditioners
    • Best Portable Air Conditioners
      • Best Dual-Hose Portable AC Units
      • Cheapest Portable Air Conditioners
      • Zero Breeze Mark 2 Review
      • Battery-Powered Air Conditioner
    • Best Window AC Units
      • Best Casement/Vertical AC Units
      • Best Saddle Air Conditioners
    • BTU Calculator
    • AC Repair
      • AC Not Working
      • How To Recharge A Window AC Unit
      • R410A PT Chart
      • Thermostat Wiring
    • Best Evaporative Coolers
  • Air Quality
    • Best Air Purifiers
      • Alen BreatheSmart Air Purifier Reviews
      • Blueair Air Purifier Reviews
      • Coway Air Purifiers Reviews
      • Dyson Air Purifiers Reviews
      • Hathaspace Smart True HEPA Air Purifier Reviews
      • Honeywell Air Purifier Reviews
      • Levoit Air Purifiers Reviews
      • Molekule Review
      • Okaysou Air Purifier Reviews
      • Winix Air Purifier Reviews
    • Air Purifier Reviews
    • Best Air Curtains
    • Best Air Purifiers For Allergies
    • Best UV Air Purifiers For Mold
    • Best Air Purifiers For Smoke
    • Best Air Scrubbers
  • Humidity
    • Best Commercial Dehumidifiers
    • Best Dehumidifiers
      • 4+6 Best Whole-House Dehumidifiers (Ducted, Portable)
      • 4 Quietest Dehumidifiers: Very Silent (52.1 dB Or Lower)
    • Best Small Dehumidifiers
    • Big Humidifiers For Large Rooms
    • Best Humidifiers For Bedroom

Tankless Water Heaters

Tankless Water Heater Wire Size Calculator: What Gauge Wire (AWG)?

by
wire size for electric on demand hot water heater

The main electric requirements for electric tankless water heaters are wire size and amp breaker size. We have explained how to easily calculate the amp breaker size here, and now we are going to look at what size wire you need for a tankless water heater. The same as for the amp breakers, you will … Read more

Categories Tankless Water Heaters 2 Comments

Tankless Water Heater Breaker Size Calculator: What Size Breaker?

by
electric tankless water heater breaker sizes

Figuring out what size breaker you need for an electric tankless water heater is fairly easy. We will show you how to calculate the tankless water heater breaker size adequately. To make things even easier, we have included Tankless Water Heater Breaker Size Calculator (just insert kW, and get breaker size) as well as a … Read more

Categories Tankless Water Heaters Leave a comment

Gas Vs Electric Water Heater Monthly Cost Comparison (State-By-State)

by

Every time we talk about water heating costs, we come across the question “Electric vs gas water heater cost; which is cheaper?”. It’s pretty much unavoidable. To put the debate if it is cheaper to heat water with gas or electricity to rest, we have made a full comparison of yearly and monthly gas vs … Read more

Categories Tankless Water Heaters, Water Heaters 5 Comments

Water Heating Costs For 1,2,3,4,5,6 Family Homes (State-By-State Analysis)

by

In the US, we spend $400 to $600 per year on water heating. Right? Well, this water heating cost has been thrown around quite a lot. But does that number apply to both 1-member and 2-member households, as well as 5-member and 6-member households? Is this the water heating cost for a 1,000 sq ft … Read more

Categories Tankless Water Heaters, Water Heaters Leave a comment

Electric Water Heating Cost, kWh Usage Per Month (State-By-State RECS Analysis)

by

Electric water heaters run on electricity. In some states, you can check how many kWh does a water heater use per month from the utility bill. However, most of us don’t really get that data, or if we do, we don’t really know if the number of kWh water heater uses per month or electric … Read more

Categories Tankless Water Heaters, Water Heaters Leave a comment

Best Smallest Tankless Water Heaters (3 Gas + 4 Electric)

by

Small tankless water heaters are on the rise. In a lot of cases, getting a small on-demand water heater is the most energy-efficient and space-saving choice. We are going to look at the 3 smallest gas tankless water heaters (with 6.5 to 7.0 GPM max. flow rate) and the 4 smallest electric tankless water heaters … Read more

Categories Tankless Water Heaters Leave a comment

4 Best Outdoor Portable Tankless Water Heaters For Camping, RVs, etc.

by

A portable tankless water heater is the most elegant way of getting hot water outdoors. If you go camping or want to use hot water in your RV, mobile home, or camper, the outdoor portable tankless water heater is the way to go; especially if you hate cold showers. Here is a quick summary of … Read more

Categories Tankless Water Heaters 1 Comment

Is A Tankless Water Heater Worth It? Does It Save Money? (Cost Calculations)

by

Nowadays, everybody is installing tankless water heaters. That’s because they are absolutely worth it and they save you money. Right? To figure out if a tankless water heater is worth it, we made a few calculations on how much money does a tankless water heater save. According to Statista’s 2016 and 2017 study, the sales … Read more

Categories Tankless Water Heaters Leave a comment

Hot Water Recirculating Pumps Explained: Why, How, Costs (+Tankless)

by

When you turn on the shower or a faucet, do you get hot water instantly? Not really. It can take anywhere from 10 seconds to 1 minute for the hot water to reach the faucet. To reduce that time significantly (and stop needlessly wasting water), we can install hot water recirculating pump. Here’s the deal … Read more

Categories Tankless Water Heaters 28 Comments

How Much Propane Does A Tankless Water Heater Use? (+ Calculator)

by

Propane tankless water heaters are the true propane guzzlers (still about 41% more economic than conventional tank water heaters). You will hardly find a propane-power appliance that uses more propane than these on-demand heaters. How much propane does a tankless water heater use exactly? The quantity of propane (and corresponding dollar expenditure) depends on 3 … Read more

Categories Tankless Water Heaters 11 Comments
Older posts
Page1 Page2 Next →

Relevant HVAC Certificates:

energy efficiency guide

HVAC metrics:

SEER = (1 × EER100% + 42 × EER75% + 45 × EER50% + 12 × EER25%)/100

EER = BTUcooling/W

HSPF = BTUheating/W

COP = Q (useful heat)/W (input work)

ACH = CFM x 60/Area x Heightceiling

Total Heat (BTU/hr.) = 4.5 x CFM x Δh (std. air)

Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. air)

Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. (std. air)

1 HP = 746 Watts

1 kW = 3413 BTU

 

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. As an Amazon Associate we earn from qualifying purchases.

  • Terms Of Use
  • Privacy Policy
  • Affiliate Disclaimer
  • About Us
  • Contact
  • Sitemap
© 2026 LearnMetrics • Built with GeneratePress