29 votes

Why does my hot water arrive at point of use slowly after water heater replacement?

Looking at your setup, I strongly suspect that your current setup added something which your old setup did not have: a heat trap. On the top of your new water heater, you can see the two short pieces ...
KMJ's user avatar
  • 11.1k
20 votes

Why did my water heater wire burn up?

Catastrophic failure When high-amperage components fail, it usually comes with some type of internal warping damage due to the higher current, which then generates heat, warps the circuitry, and ...
Nelson's user avatar
  • 1,841
17 votes
Accepted

Why did my water heater wire burn up?

Joints get hot when they are not crimped or secured tightly. As they are loose this increases the resistance and this increases the losses which manifest as heat. We often use the heating effect of an ...
Solar Mike's user avatar
  • 27.4k
10 votes

Is 200 amp service enough for a tankless water heater with a 100 amp sub panel?

Let's see. 5.5 GPM at 8.35 pounds per gallon, so 46 pounds per minute. 2755 pounds per hour. To raise 1 pound of water 1 degree F takes 1 scientific BTU ( not to be confused with the commercial BTU ...
Harper - Reinstate Monica's user avatar
7 votes

Why does my hot water arrive at point of use slowly after water heater replacement?

Is the setpoint the same as it was on your old water heater? My guess is that the temperature has been set lower. It is a trend in the effort of lowering energy costs and prevent scalding injuries to ...
sleblanc's user avatar
  • 281
6 votes

Why does my hot water arrive at point of use slowly after water heater replacement?

Try to measure or guess the length of pipe from the water heater to the faucet. Then, using the internal diameter, compute the volume. I'm French, so I'll use metric: Suppose your pipes have 20mm ...
bobflux's user avatar
  • 9,178
4 votes

Why does my tankless gas water heater shut off when cold water is turned on?

We had this same problem with our Bosch gas fired tankless water heater (WH). There are different ways to fix this depending on your situation. What is happening is that you are using such a low flow ...
Jim Stewart's user avatar
  • 21.6k
3 votes
Accepted

How can I prevent adjacent gas appliances from snuffing each other out?

The manual for the heater is available from Takagi. I'm assuming that you're working with natural gas at 4 ounce pressure -- if the pressure in the long feed line is higher, or if the fuel is propane, ...
Greg Hill's user avatar
  • 30.4k
3 votes

Why do I have water temperature fluctuation?

The bad cartridge (causing backflow from cold into the hot line) might well be in a different valve. There might also be more than one. Look for a faucet/fixture where the hot line (run some hot to ...
Ecnerwal's user avatar
  • 211k
2 votes
Accepted

Diagnosing water heater - can I apply voltage to a thermocouple?

In theory yes if you had an appropriate DC source lying around you might be able to use it to operate the gas valve. Note that the resistance of the solenoid may be very low and its current demands ...
Greg Hill's user avatar
  • 30.4k
2 votes
Accepted

How can I test the thermostat for an immersion heater?

Your understanding is fairly accurate where as zero ohms would indicate a short but low ohms would indicate a load, not a short. After turning the power off,you could test the thermostat by removing ...
JACK's user avatar
  • 79.9k
2 votes

Water heater working when flushing a toilet

I had a tankless water heater installed in November 2023. When I flush either of my 2 toilets the WH makes a noise. I pulled the cover and discovered it's the purge fan for the combustion chamber that'...
Don's user avatar
  • 21
1 vote

How can I test the thermostat for an immersion heater?

If this unit is like a conventional domestic hot-water cylinder, then its often rigged so either element can run but not both at the same time. The incoming cold water lays at the bottom and the hot ...
Criggie's user avatar
  • 10.5k
1 vote

How can I test the thermostat for an immersion heater?

Simply measure the heater resistance, *with all power off. You can figure out what it should be from Ohm's law, but I'd guess it'd be in the range of ~10 to 20 Ω. As an example 4 kW heater, at 220 VAC,...
DrMoishe Pippik's user avatar
1 vote

Is high standby power consumption of heat pump water heater normal and how to reduce?

But in standby it's still 30W. That's ridiculously high. Make sure you measured Watts and not VA. Normally, for residential use, utility meters only bill real watts. But if you measure current with a ...
bobflux's user avatar
  • 9,178
1 vote

Hybrid Water Heater with Gas Backup?

If you get past the pure economics of a hybrid water heater running in electric resistance mode when it's cold, there's still another consideration. Keeping the heater out of resistance mode when it'...
Jdub's user avatar
  • 11

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