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UPS Volt vs Kemot for Fireplace with Water Jacket: Which Brand to Choose & Why?

zulusj23 20511 13
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  • #1 18937289
    zulusj23
    Level 25  
    Good day.
    I plan to buy a real USP for a fireplace with a water jacket. Please suggest which brand of device to choose. Prices and options are practically the same. Personally, I am leaning towards the Volt due to the possibility of setting a lower battery charging current. Surely you have some experience and it is possible that you have even used a device from both of these companies.
    Regards.
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  • #2 18937906
    Jan_Werbinski
    Level 33  
    Do not buy this "brand" or you will be in trouble. You will find information about this on every forum.
  • #3 18938857
    Prof. SpecMiernik
    Level 27  
    I use Techtron (with a constant phase because the boiler requires it).
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  • Helpful post
    #4 18938883
    Mierzejewski46
    Level 37  
    Kemot works in my boiler room. Three years without charge. 300 watts on a 45 Ah recycled battery. It supplies two pumps with a total of approx. 100W. Now after the warranty I took it apart for cleaning. Good quality workmanship. It always powers my pumps in storms. I recommend. The waveform on the oscilloscope "pure sine wave".
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  • #5 18938961
    zulusj23
    Level 25  
    He has a permanently set charging current of 10A. Doesn't cook the battery?
  • #6 18939146
    Mierzejewski46
    Level 37  
    Techtron's-tech.300 is your best choice. And domestic production.
    Kemot does not charge with constant current, these 10A is max. charging current. Chinese but solidly made.
  • #8 18939295
    Mierzejewski46
    Level 37  
    I bought mine from a friend in an electronics store for PLN 370. He recommended it to me, and since the guy is good at electronics and doesn't sell junk, I took it. Then I delved a bit into the subject and Lechpol is not a manufacturer but an importer from the Far East. I will not say a bad word about this device. Except maybe one. The AVR is poorly developed and the voltage stabilization is a bit lame. Besides, three years I don't know what power to the furnace is. Now, maybe I would buy Techtron more out of sentiment for Polish producers. But only because.
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  • #10 19905634
    Mierzejewski46
    Level 37  
    And my Kemot power supply with a Forse 74Ah car battery in the last storms powered a central heating stove with a controller and a pump with a power consumption of 55W for 10 hours. Enough. The cost of the entire power supply is PLN 800.
  • #11 20310208
    marekchelsea
    Level 9  
    I bought a month ago Techtron ZA-TECH 300 and AGM 100 Ah AZO DIGITAL battery. Decent equipment, but only time will tell. User reviews are flattering. Techtron is not manufactured in Poland, just to be clear. They produce in China, there is info on the housing and instructions. The importer is Volt Polska commissioned by Techtron. They apparently cooperate, but Techtron has much better equipment than Volt Polska. The weight itself already shows the difference, the Techtron 6 kg and the Volt 4.2 kg, the parameters also.
  • #12 20895609
    Jan-Osik
    Level 10  

    I can confirm that the first za-tech model 500W power supply, purchased in 2015, is still working and connected to the network 24/7.
    Also, my opinion about Techtron is very positive and the equipment is cool.

    I'm wondering whether to preventively replace it with a new one and use the old one for less important power supply.
    Because 8 years is quite a long period of operation for this type of electronics (at least I think so), and I wouldn't want something to happen at a critical moment.
    Maybe it will work for a few more years, but who knows.

    I'm wondering whether to use a power supply with the same power:
    https://techtron.pl/p2626,zasilacz-awaryjny-12v-230v-500w-za-tech-500-sf-techtron.html

    Or something bigger and try to connect a refrigerator with a new type of compressor (inverter).
    It looks like 700W would be enough for me:
    https://techtron.pl/p2737,zasilacz-awaryjny-ups-700w-1000va-za-tech-700-sf.html

    So I'm browsing the forum and looking for information...
  • #13 21358049
    adasko021
    Level 9  
    >>20310208 Does anyone know what voltage on the battery the Techtron charges to, and what voltage the Volt or Kemot charges to? Something writes that Volt has a max of 13.8V and they recommend AGM batteries. As far as I know, AGMs are charged up to 14.4-14.7V. The Kemot, on the other hand, charges to 14.5V. I'm thinking of buying and connecting the Volt to a regular lead-acid car battery, which is why I'm asking about the voltage, because in the Volt's manual they advise against such a connection.
  • #14 21363004
    Jan-Osik
    Level 10  
    The za-tech Techtron uninterruptible power supply has two voltages, one equalising (or whatever it's called there) and this is over 14V (in my case it was something around 14.4-5V) and then goes to the backup voltage (around 13.6V), which is as it should be.


    Choosing a car battery is probably not a good choice. Read and watch the video
    https://techtron.pl/i17,jaki-akumulator-wybrac.html
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Topic summary

✨ The discussion compares UPS brands Volt and Kemot for use with fireplaces equipped with water jackets, focusing on battery charging characteristics and reliability. Kemot is praised for solid build quality, pure sine wave output, and reliable operation over several years powering pumps and heating controllers, though it has a fixed maximum charging current of 10A and charges batteries up to approximately 14.5V, suitable for AGM batteries. Volt devices are lighter with a maximum charging voltage around 13.8V, recommended primarily for AGM batteries, and may not be ideal for standard lead-acid batteries. Techtron, a Polish-imported brand manufactured in China and distributed by Volt Polska, is highly regarded for quality and longevity, with models such as ZA-TECH 300, ZA-TECH 350, ZA-TECH 500, and ZA-TECH 700 offering pure sine wave output and adjustable charging voltages (around 14.4-14.7V for equalizing and 13.6V for backup). Users note that car batteries are generally not recommended, and proper battery selection is critical. Techtron’s domestic production sentiment and better technical parameters make it a preferred choice for some, despite slightly higher prices. Overall, Kemot and Techtron are recommended over Volt for stable, long-term operation in heating systems with water jackets.
Generated by the language model.

FAQ

TL;DR: For boiler/pump backup, Techtron shows long-term reliability: one ZA‑TECH ran 24/7 for 8 years, “equipment is cool.” If uptime is critical, consider a preventative refresh or upsizing for added loads. [Elektroda, Jan-Osik, post #20895609]

Why it matters: Homeowners with fireplaces and boiler rooms need reliable pump/controller backup during outages; this FAQ curates real-world picks, runtimes, and charging behavior.

Quick Facts

What’s the best UPS brand for a fireplace with water jacket: Volt, Kemot, or Techtron?

User experience favors Techtron for heating systems. One recommendation was clear: “Techtron’s-tech.300 is your best choice.” The same user noted Kemot is Chinese but solidly made and uses a 10 A max charger. Match features and battery to your load. [Elektroda, Mierzejewski46, post #18939146]

Do I need a UPS with constant phase for my boiler controller?

Many boiler controllers expect a constant phase reference. A user explicitly chose Techtron for this reason: “with a constant phase because the boiler requires it.” Check your boiler’s manual and select accordingly. [Elektroda, Prof. SpecMiernik, post #18938857]

Will a fixed 10 A charger on Kemot cook the battery?

Kemot does not push a constant 10 A. The 10 A figure is its maximum charging current. That reduces continuous stress compared with a fixed-current charger. Ensure proper battery sizing and ventilation. [Elektroda, Mierzejewski46, post #18939146]

Is Techtron made in Poland, or who actually imports it?

One buyer reported Techtron is produced in China, with Volt Polska as the importer for Techtron. They also observed a weight gap: Techtron 6 kg versus Volt 4.2 kg, reflecting different builds. [Elektroda, marekchelsea, post #20310208]

How much runtime can I expect around a 55 W load?

A Kemot paired with a 74 Ah car battery powered a 55 W stove controller and pump for 10 hours. The full setup cost about PLN 800. Use this as a sizing datapoint when choosing capacity. [Elektroda, Mierzejewski46, post #19905634]

Can a Kemot 300 W run two pumps (~100 W) on a 45 Ah battery?

Yes, per a long-term field report. Kemot 300 W ran two pumps totaling ~100 W from a 45 Ah battery for three years. The output was checked on an oscilloscope as “pure sine wave.” [Elektroda, Mierzejewski46, post #18938883]

Should I replace an 8‑year‑old ZA‑TECH proactively?

One owner’s 500 W ZA‑TECH has worked 24/7 since 2015 and still runs fine. They are considering a preventive replacement for critical use and repurposing the old unit for less critical loads. [Elektroda, Jan-Osik, post #20895609]

What charging voltages do Techtron units use, and can I connect a car battery?

A user saw equalizing at about 14.4–14.5 V, then float around 13.6 V. They advised against choosing a car battery, pointing to Techtron’s guidance. “Choosing a car battery is probably not a good choice.” [Elektroda, Jan-Osik, post #21363004]

Does Volt charge only to 13.8 V, and is that OK for AGM?

One poster questioned Volt’s max of 13.8 V and noted AGMs often target 14.4–14.7 V. They also referenced Volt manuals warning against car batteries. Verify your model’s manual and charge profile before buying. [Elektroda, adasko021, post #21358049]

Can a ZA‑TECH 700 W run a fridge with an inverter compressor?

A user evaluating a 700 W ZA‑TECH believed it would cover an inverter fridge. Confirm your fridge’s peak draw and the UPS surge rating. Keep headroom for startup. [Elektroda, Jan-Osik, post #20895609]

Does Kemot output a pure sine wave?

Yes in at least one measured case. An owner observed a “pure sine wave” on an oscilloscope while powering boiler pumps. That setup ran reliably over years. [Elektroda, Mierzejewski46, post #18938883]

How stable is Kemot’s AVR?

One long-term user praised build quality but called the AVR weak. They wrote voltage stabilization was “a bit lame.” Consider this if your controller needs tight regulation. [Elektroda, Mierzejewski46, post #18939295]

Quick sizing rule for boiler rooms?

A practical example: about 100 W of pumps ran from a 300 W Kemot for years. Selecting a unit several times your continuous load adds startup headroom. [Elektroda, Mierzejewski46, post #18938883]

How do I test my setup before storm season?

Do a quick pre‑storm check.
  1. Simulate a mains outage to force battery mode.
  2. Time runtime at typical load and log watts/hours.
  3. Inspect terminals, clean dust, and verify charger transitions. “It always powers my pumps in storms,” one owner noted. [Elektroda, Mierzejewski46, post #18938883]

Any red flags or brands to avoid?

One commenter gave a blunt warning: “Do not buy this ‘brand’ or you will be in trouble.” Treat vague branding and unclear specs as red flags, and verify before purchase. [Elektroda, Jan_Werbinski, post #18937906]

Is adjustable charging current on Volt worth it?

The thread opener leaned toward Volt for adjustable, lower charge current. Lower current can help small batteries and reduce stress. Confirm the model’s adjustment range and match it to your battery rating. [Elektroda, zulusj23, post #18937289]
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