Thanks for the summary.
American dishwashers don't have their own heater? All dishwashers I've seen in Australia only have cold water supply.
American dishwashers don't have their own heater? All dishwashers I've seen in Australia only have cold water supply.
15, dishwasher manufacturers can't assume the dishwasher is on a 20.
Trying to run a resistive heater on the same circuit as a fridge compressor without tripping leans towards very conservative wattage
Just a waste of copper and a beaker really.
But also helps avoid the case where your coffee maker trips the breaker shared with your refrigerator and you don't notice until the food in the refrigerator is warm. (which was a risk in my previous apartment - the counter circuits were shared with the refrigerator). I think it makes sense to have it as a separate circuit.
Ouch. Code here (Ontario) is that not only does the fridge need a separate circuit, but counter outlets need two separate circuits: each socket on the duplex outlet is required to be on a separate circuit (although multiple outlets can all share the same two circuits, but you're supposed to alternate top and bottom).
Of course, if your home is older than I am or it's a handyman special, all bets are off. If I run the microwave while someone is vacuuming in another part of the house it'll trip the breaker.
> But also helps avoid the case where your coffee maker trips the breaker shared with your refrigerator and you don't notice until the food in the refrigerator is warm.
Didn’t notice the coffee was cold?
Overall, given the massive fears of a fridge failure, which can happen beyond just electrical failures, very very very few people have any kind of monitoring/alarming for this event. You’d think that would be the first requirement.
It sounds like this law is outdated.
Kitchens in general have required 20 amp general purpose circuits since at least the early 80s. However the NEC (but not the Canadian equivalent) allows for 15 amp duplex receptacles on 20 amp circuits so home builders looking to save a few pennies often use those. Besides, there are few if any, residential appliances out there that have NEMA 5-20 plugs. Then again hardwiring dishwashers was pretty common up until recently.
post world war 2 consumer choice culture in the US led to people buying cheaper clothing but varying their outfits every day and cleaning them (with copious availability of water) with less intensity.
once these patterns are established in the market, they become more like customary and it's what consumers expect of their appliances, detergents, etc.
Some do, some don't.
The ones that do vary in ability by overall dishwasher quality.
The ones that don't are hooked up to the kitchen's hot water line.
This is considered more energy efficient because a home's hot water heater (whether electric, gas, or another fuel) is better at heating the water in a bulk capacity than a tiny heater in the dishwasher.
The downside is that the cold water between the big water heater and the dishwasher has to be purged first for it to be really effective. If your hot water heater is in the other side of the wall, no problem. If it's six rooms away, problem.
Depends on how you have it set. My current and previous hot water heaters had thermostats which permitted adjusting the temperature.
They also had warning labels on them about scalding water. If it's hot enough to scald, it's hot enough.
The dishwasher also doesn't need to heat up a "bulk" amount of water, just the amount of water used for washing the current load of dishes.
If you're washing dishes and someone is, or has recently, taken a shower; or someone is, or has recently, done laundry; or someone is, or has recently shaved or done any of the other dozen things that draw from the hot water heater, then the water is already hot and available and doesn't need to be heated all the way from cold by the dishwasher. A properly insulated hot water heater can retain heat for quite some time.
Also the size of the heating element is irrelevant. What matters is the power dissipated. Most dishwashers in the US will use only about 900 watts of power even when plugged into a circuit that supports 1500 watts. In the EU they often hit 3000 watts. Even when just heating up a gallon or two of water that makes a huge difference.
Here is what I got from Gemini:
Bosch does not refer to their dishwashers as having a "heat pump" in the same way the term is used for HVAC systems; rather, the part is often called a circulation motor and heating assembly or a combined "heater/pump" unit by users and repair sites. Bosch dishwashers use a flow-through water heater (a type of resistive element) to heat the water and a different, non-refrigerant-based system for drying. How the Bosch System Works
Water Heating: All Bosch dishwashers use a flow-through water heater, which is a heating element integrated with the circulation pump. This system rapidly increases the water temperature to the required level. It uses electrical resistance, not the reverse-refrigeration cycle of a true heat pump.
Drying: Bosch dishwashers (especially the higher-end models with features like CrystalDry) typically do not use a separate heating element for drying. Instead, they rely on a process involving a stainless steel tub and a heat exchanger or a mineral-based drying technology (like Zeolith for CrystalDry) to condense moisture and wick it away from the dishes. This is an energy-efficient method of moisture removal, not active heat generation for drying.
Anything that moves heat from one area to another, not just evening them out but actually forcing the heat to move, counts as a heat pump. HVAC style, or peltier style, or other methods with tension or chemical reactions all count.
A combination heater and circulator does not do that. It is not a heat pump.
It’s not like the engineers for heaterless dishwashers are just too stupid to realize there’s an obvious workaround for having to purge the line before filling the basin. Especially when the performance is so much measurably better when you do it.
Like I said though, it’s a guess. It’s also possible efficiency certifications ding you for the excess water use.
It's for comfort and convenience.
Problem is, that most dishwashers have a prewash and a main wash. By the time the prewash is finished and the main wash starts, the water in the supply line will have cooled off quite a bit.
This almost made a mess when the sink was clogged and the dishwasher tried to pump the water out but had nowhere to go.
The airgap causes the pump to be physically incapable of backfeeding the drinking water supply with dishwasher waste
my wife once decided to dump into garbage disposal a bunch of uncooked broccoli at once. it clogged garbage disposal and drain. when i tried to unclog it with plunger it backed into dishwasher (was hooked directly to garbage disposal bypassing airgap). took me hour to get everything out of dishwasher.
Whenever natural gas supply is turned off in the US, for any reason, only the gas company can turn it back on. And they can't do so if there's a leak at all. You have to call a plumber to come out, detect the leaks, and fix them. After that, you can call the gas company to come back out (but not on a weekend) to turn it back on. And a same-day request for service requires someone to be home ALL DAY after it's called in.
And this is how I ended up showering at work for three days that week after not having had one over the weekend.
This just happens to be the one that affected me. Like modern gas water heaters that have electric ignition instead of pilot lights, because the one serious reason to have gas water heaters is that they work when there is no electricity. Now it’s just a price distinction.
Natural gas is mostly methane, which is lighter than air and easily escapes most structures.
Doesn't match my experience. My colleagues and I are able to turn on or off the gas supply to our houses at will.
I discovered the unexpected value of a YMCA membership when my hot water was offline for a while.
I had a seismic shutoff installed at my gas meter and the plumber who installed it had no problem turning off the gas and turning it back on when he was done. (and then turning it off again to demonstrate to me how it worked).
He re-lit the water heater pilot light before he left. The gas company was not involved at all.
retrofitting old traditional houses (especially stone) with higher capacity plumbing was expensive and infeasible, so putting heaters in appliances was a cope for markets that needed it.