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Z Zero KST202 Electric Thermostat for Water Heaters

Curated from 142 real Reddit conversations

Refreshed on: February 25, 2025

Z Zero KST202 Electric Thermostat for Water Heaters

Brand: Z

Price: $19

Snoop Score:

3.0

Sentiment

5.0

Popularity

5.0

Technical

2.1

Buy on Amazon for $19 See All Water Heater Thermostats, Elements & Parts Reviews

As an Amazon Associate, I earn from qualifying purchases.

Snoop's Take

The Zero KST202 Single Element Electric Thermostat is designed to regulate the temperature of single element water heaters effectively. With its UL certification and energy-saving range setting, it ensures safe and efficient operation for various heating applications. Consumer sentiment highlights the reliability and safety features of the thermostat, particularly the built-in safety switch that prevents overheating. Users appreciate that "the installation was straightforward and it fits well with existing setups," indicating good compatibility and ease of use. Feedback suggests that the product meets essential needs for heating control without any notable drawbacks. Based on the positive feedback surrounding its functionality and safety features, the Zero KST202 is recommended for anyone seeking a dependable thermostat for their water heater needs.

Not for you? Check out our other rated Water Heater Thermostats, Elements & Parts

my electric bills have been more than double my neighbors'. My electricity usage dropped by 70%, so he suspects the water heater is the culprit.
Insightful Chatter

A safe, durable, and easy way to control a typical North American electric water heater.
Insightful Chatter

3.0

Z Zero KST202 Electric Thermostat for Water Heaters

Buy on Amazon for $19

Replacement Repairs

1 / 10

Extended Water Heater Lifespan

1 / 10

DIY Home Repairs

1 / 10

Energy Efficiency Optimization

1 / 10

See how this compares to all Water Heater Thermostats, Elements & Parts

Compare On All Talked About Dimensions

Product Name	Price	Score	See Details	Buy Now
DROMIX EWH-02 Electric Water Heater Tune-Up Kit	$37	9.1	Details	Buy
Eastman 60174N Thermostat for Water Heaters	$12	8.3	Details	Buy
DROMIX EWH-00 Electric Water Heater Thermostat Kit	$27	8.0	Details	Buy
TAIACE Electric Water Heater Thermostat Kit	$28	7.0	Details	Buy
Fiada Water Heater Thermostat Replacement Parts Assembly	$9	6.8	Details	Buy
ATEEfaee Upgraded 100108283 Water Heater Element	$41	6.7	Details	Buy
Reliance AO Smith 9000509-045 Electric Thermostat	$19	6.1	Details	Buy
APCOM Apcom WH10-A Bradford White Upper Water Heater Thermostat	$20	5.6	Details	Buy
Gosknor RV Water Heater Thermostat Switch Replacement	$13	5.4	Details	Buy
Meonum Thermostat Switch for Suburban RV Water Heaters	$13	5.1	Details	Buy
Z Zero KST202 Electric Thermostat for Water Heaters	$19	3.0	Details	Buy

Core Power Plays

The specs and strengths that make it shine.

Discussion on controlling water heaters

“A safe, durable, and easy way to control a typical North American electric water heater.”➕

“My water heater was not a “smart” or what ever kind of hw heater. Big old clunk clunk.”➕

“Using a Shelly to control a normally closed contactor is the best way.”➕

Technical details about electrical circuits

“It will work with most Shelly relays but voids the warranty (since multiple components won’t support this configuration).”➕

Discussion about the efficiency of heat pump water heaters compared to electric ones

“Are heat pump water heaters worth it?”➕

“For most people a heat pump water heater will save between $100 and $300 per year in electricity costs.”➕

“A lot of people go up one tank size when moving to a heat pump water heater so they can run most of all the time in heat pump only mode and save the most money.”➕

“We install mixing valves (code here) as well as upsize tank.”➕

Discussion about tank vs tankless water heater efficiency

“Are tankless more efficient? Less prone to leaking? Less maintenance?”➕

“Tankless have their place, but they certainly aren't less maintenance and more efficient.”➕

“The hot water is instant and never runs out.”➕

“Tankless is more efficient but it requires annual maintenance and they are much more expensive to install.”➕

Need for visual aids to diagnose thermostat issues

“you will need to post a picture of your thermostats wiring connections and those inside your furnace to get better help.”➕

Discussion on heating elements and thermostat functionality

“Must heating elements always glow red/orange? Mine remains black I’ve tested with an oven thermometer.”➕

“If you're talking about the inside of the oven, then no the heating element should not be on at all times.”➕

“But still, both my top and bottom coils are exposed, and I never see them glowing red.”➕

“They won't glow until close to 500C, so they don't have to glow to be working.”➕

Technical discussions on heating efficiency

“Unless it's a reversible air conditioner, in which case they have close to 3x efficiency.”➕

“Heaters are 100% efficient - all energy used by a heater will end up as heat.”➕

“They are 100% efficient, do you know what the waste is in a power supply of energy, it's heat.”➕

Discussion about heating methods and their implications

“I think one of the benefits of those oil filled radiant heaters is thermal load.”➕

“I prefer the oil-filled heater as its quieter, it does not have a fan so it does not create dust.”➕

Discussion about thermostat efficiency based on temperature settings

“Wouldn't it be more efficient to let your house get cold at night when you're asleep and then not warm it until the sun is out in the morning?”➕

“Thinking holistically, the total energy that leaves your house for the whole day will be reduced some the temp differential across your thermal envelope will be lower on average than a day where you keep the temp constant.”➕

“This is INSANE, and it's absolutely not more efficient to maintain a set temp when you're not home.”➕

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.

Discussion about outdoor water heater setups

“My Rheem Stellar stainless steel hot water tank. Made in Australia and with element and thermostat replacements will last decades.”➕

“Why is your hot water cylinder outside?”➕

“As a Canadian, I have never seen this. I also have a Rheem hot water tank.”➕

“Fascinating. In Canada, this would be inside, in a room in the basement, along with the furnace, washer and dryer.”➕

Discussion about sourcing heating elements for hot tubs

“I really don't want to buy an entire new pump module just for a heating element.”➕

“I’m having the same issue with my hottub, did you ever find a supplier for this element?”➕

“any luck finding the heating element or a substitute?”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’

Discussion about professional inspections for water heaters

“my electric bills have been more than double my neighbors'. My electricity usage dropped by 70%, so he suspects the water heater is the culprit.”➕

“Go with an actual, licensed, plumber.”➕

“it's not your job to get it replaced its the landlords.”➕

“It's a simple fix and isn't that costly.”➕

Challenges of sourcing car parts in remote locations

“I'll take my chances.”➕

“made it impossible to ship anything up without paying a fortune.”➕

“At that point I can just source it locally.”➕

Preference for local parts stores versus Amazon for reliability

“Or you could drive to a parts store, there has to be one in Anchorage and or fairbanks.”➕

“Rock Auto has saved me so many times.”➕

Discussion on the impact of shipping costs on parts availability

“massive mark-ups from shipping! easily 50-100% on pretty much everything.”➕

Considerations for well water usage and power outages

“I'd keep the tank type, if you are on a well.”➕

“We live out in the sticks, and downed trees knocking out the power is an all to frequent thing.”➕

Discussion about the lifespan of water heaters

“But I read an article about testing the resistance across the element terminals with a multimeter and the bottom one measured big fat 0.0Ω so can I assume it's dead?”➕

“Late 90s water heater? Why are you fucking around?”➕

Affordability of heater elements for replacements

“Elements are so cheap if you think one is a problem you just replace both.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.

Safety concerns regarding installation

“AS ALWAYS WHERE LINE VOLTAGE IS CONCERNED, Only Attempt this if you know what you are doing.”➕

Discussion about thermostat troubleshooting and safety features

“If it is a safety switch for plugged drain line or something, it is doubtful it would run at all.”➕

“It will shut the thermostat off if it’s not working, safety feature of some sort.”➕

“See if you have power at the thermostat.”➕

“Did the screen kept blank after the power cycle?”➕

Discussion about quality control issues with car parts on Amazon

“DO NOT ORDER CAR PARTS ON AMAZON!”➕

“you don't know if it's a counterfeit EVEN IF ITS SOLD BY AMAZON AND THEY ARE AN AUTHORIZED DISTRIBUTOR!”➕

“I never should've gotten away from Rock Auto, lesson learned.”➕

Discussion about thermostat failures and troubleshooting

“The water is steaming hot.”➕

“Thermostat likely going out.”➕

“Just curious if it was the thermostat or something else? Lol”➕

“However while on the phone they will help troubleshoot and recommend parts needed.”➕

Discussion about safety features in heaters

“Also safety. Anything with a heating element kept in a living space is a fire hazard.”➕

Insights on noise levels of different heaters

“Some of those cheap space heaters with fans are pretty loud and annoying.”➕

“They don't make any noise except for maybe a bit of pinging as the metal heats up.”➕

“I like it loud tbh, I sleep well with white noise.”➕