Best instant hot water dispenser: the maker spec sheets sort InSinkErator and Moen by tank, wattage, temperature ceiling and warranty years, and a free sink hole plus an outlet decides before any of that
Maker sheets compared: InSinkErator HOT150 750 W, 2/3 gal, 160 to 210 F, 1 year; HOT250 same tank, 3 years in-home; Moen IH2300 1500 W, 140 to 190 F, 40 cups/hour.
- Verified
- Updated
- 11 min read
- 12 sources
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Short answer
If the sink has a free 1-3/8 in hole and a grounded GFCI outlet in the cabinet below, the pick is the InSinkErator HOT250: its spec sheet WDT586-23D prints a 750 W, 2/3-gallon tank, a thermostat adjustable from 160 F to 210 F and pre-set at 200 F, a counter limit of 3 in and a 3-year in-home limited warranty covering parts and labor. The budget runner-up is the Invite HOT150, the same 750 W, 2/3-gallon tank on a 1-year in-home warranty with a 2 in counter limit; its product page prints up to 60 cups per hour. Moen’s IH2300 tank prints 1500 W, 140 F to 190 F and 40 cups per hour, on a 1-year warranty, and pairs only with Moen’s own SIP faucets. Skip all of them if neither the hole nor the outlet exists: every maker document read makes both a requirement, and a plumber plus an electrician cost more than the tap.
The picks
Has a free 1-3/8 in hole and an outlet, wants the lowest price
InSinkErator Invite HOT150, Satin Nickel (H-HOT150SN-SS)
InSinkErator submittal sheet: 115 V, 750 W, 6.25 A, 2/3-gallon tank, 1-3/8 in hole, counter up to 2 in thick, 30 to 80 psi, 1-year in-home limited warranty; product page: up to 60 cups per hour, 160 to 210 F
Same tank as the HOT150 but wants 3 years of parts and labor
InSinkErator HOT250 hot-only, Satin Nickel (H250SN-SS)
InSinkErator spec sheet WDT586-23D: 115 V, 750 W, 2/3-gallon tank, 160 to 210 F pre-set at 200 F, 1-3/8 in hole, counter up to 3 in, 15 to 80 psi, NSF/ANSI 372 and NSF/ANSI/CAN 61 printed, 3-year in-home limited warranty
Wants a filter-ready cold tap through the same hole
InSinkErator HC250 hot and cold, Satin Nickel (HC250SN-SS)
InSinkErator HC250 product page: 750 W, 2/3 gallon, 1-3/8 in hole, cold tap filter-ready with an optional InSinkErator filter, ADA compliant, NSF/ANSI/CAN 372 and 61 printed, 3-year in-home warranty
Already owns an InSinkErator dispenser tap and needs a new tank plus a filter
InSinkErator HWT-F1000S tank with F-1000S filtration (dispenser sold separately)
InSinkErator submittal sheet: 2/3-gallon stainless tank, 60 cups of 200 F water per hour, 115 V, 750 W, 160 to 210 F, 30 to 80 psi, NSF/ANSI 372, tank 3 years and filtration 1 year; not for the Hot1 or Hot100
Has a filter-ready dispenser and city water that tastes of chlorine
InSinkErator F-1000S filtration system (add-on)
InSinkErator HOT250 manual: the optional F1000S or F2000S filter mounts on the cold supply only, maximum water temperature 100 F, 30 to 80 psi, cartridge replaced every 6 months; HWT-F1000S sheet: F-1000S reduces particulates and chlorine taste and odor
If you cannot name the diameter of the spare hole in your sink, or there is no outlet in the cabinet below it, close this page: a kettle costs less than the hole saw and the electrician these tanks require.
How was this shortlist built?
Every figure here is a manufacturer-published specification read on 2026-10-09 from the document named beside it; nothing was installed, run or used by this site, and every listed ASIN was confirmed in stock the same day. Units were compared on tank size, wattage, temperature range, cups per hour, sink hole, counter thickness, supply pressure, filter option, printed standards and warranty years.
Three gaps are stated, not filled. No Waste King or Franke spec sheet could be opened, so neither brand has a row. InSinkErator prints no cups-per-hour figure for the HOT250, so that cell says so. Moen’s IH2300 tank was listed as scarce on 2026-10-09, so it is in the table but carries no link.
An instant hot water dispenser is a small insulated tank under the sink, kept near boiling by a thermostat, with a dedicated tap on the sink deck that opens it. The HOT250 manual calls the tank non-pressurized: it vents through the spout, which is why it needs its own tap and cannot feed the kitchen faucet.
How do the units compare on paper?
| Unit | Tank | Watts | Temperature | Cups per hour | Sink hole | Counter max | Filter option | Standard printed | Warranty |
|---|---|---|---|---|---|---|---|---|---|
| InSinkErator Invite HOT150 | 2/3 gal | 750 | 160 to 210 F | Up to 60 (product page) | 1-3/8 in | 2 in | Not printed | NSF/ANSI/CAN 61 (product page) | 1 year in-home |
| InSinkErator HOT250 | 2/3 gal | 750 | 160 to 210 F, pre-set 200 F | Not printed | 1-3/8 in | 3 in | F1000S or F2000S, cold line (manual) | NSF/ANSI 372, NSF/ANSI/CAN 61 | 3 years in-home, parts and labor |
| InSinkErator HC250 hot and cold | 2/3 gal | 750 | 160 to 210 F, pre-set 200 F | Not printed | 1-3/8 in | 3 in | Cold tap filter-ready, optional InSinkErator filter | NSF/ANSI 372, NSF/ANSI/CAN 61, ADA | 3 years in-home, parts and labor |
| InSinkErator HWT-F1000S tank (tap sold separately) | 2/3 gal | 750 | 160 to 210 F, pre-set 200 F | 60 at 200 F | Set by the tap | Set by the tap | F-1000S included | NSF/ANSI 372 | Tank 3 years, filtration 1 year |
| Moen IH2300 tank (SIP faucet sold separately) | 5/8 gal | 1500 | 140 to 190 F | 40 | Not printed (faucet page says one hole) | Not printed | Not printed | UL499, CSA C22.2 64, ASSE 1023 | 1 year |
Supply pressure from the same sheets: 15 to 80 psi for the HOT250, 30 to 80 psi recommended for the HOT150 and the HWT-F1000S. Every InSinkErator unit above runs on 115 V; Moen prints 120 V, 60 Hz.
What do the makers require before you buy?
The spec sheets put two conditions ahead of any feature, and they are the reason most readers should stop here.
| Requirement | InSinkErator HOT250 (sheet and manual) | Moen IH2300 (sheet and install article) |
|---|---|---|
| Sink hole | 1-3/8 in; cut with a 1-3/8 to 1-1/2 in hole saw, or reuse a sprayer hole with the hose line plugged | One hole on the faucet page; diameter not printed |
| Outlet | Grounded GFCI outlet under the sink, powered continuously, 15 amp circuit at 120 V | 15 or 20 ampere fused grounded supply, not switch-controlled, separate circuit recommended; GFCI not mentioned |
| Switch | Not on the disposer’s wall switch unless a SinkTop Switch is used | Outlet must not be controlled by an on/off switch |
| Placement | Ambient 40 F to 110 F | Tank vertical, 4 in of air space on sides and top, within 30 in of the outlet (35 in cord) |
A sink that already carries a disposal on a wall switch is the common trap: the HOT250 manual rules that switch out for the tank. The garbage disposal review and the InSinkErator disposal cross-reference show which models the SinkTop Switch exists for, and that is the moment to count outlets under the sink.
If the spare hole is already taken by a side sprayer or a soap pump, the choice is between plugging that line, as the HOT250 manual describes, and swapping to a single-hole faucet from the kitchen faucet review to free one.
InSinkErator Invite HOT150: buy it or skip it?
Buy it if the sink and the outlet already qualify and the price decides. The Invite HOT150 submittal sheet prints 115 V, 750 W, 6.25 A, a 2/3-gallon tank, a 1-3/8 in hole, a counter up to 2 in thick, 30 to 80 psi recommended and a 1-Year In-Home Limited Warranty. The product page adds up to 60 cups per hour, 160 F to 210 F and a 0.75 gpm flow.
The flaw is the warranty: the HOT250 below is the same wattage, tank and temperature range on 3 years instead of 1, and the HOT150 sheet caps the counter at 2 in where the HOT250 allows 3.
Skip it if the counter is thicker than 2 in, or if you want a filter: the HOT150 documents read this session print no filter option.
InSinkErator HOT250: buy it or skip it?
Buy it if 3 years of in-home parts and labor is worth the step up from the HOT150. Spec sheet WDT586-23D prints 115 V, 750 W, a 2/3-gallon tank, a thermostat from 160 F to 210 F pre-set at 200 F, a 1-3/8 in hole, a counter up to 3 in, 15 to 80 psi, NSF/ANSI 372 and NSF/ANSI/CAN 61, and the 3-Year In-Home Limited Warranty.
The flaw is the missing throughput figure: neither the sheet, the manual nor the product page prints cups per hour for the HOT250, so the only maker figure for this 750 W, 2/3-gallon tank family is the 60 cups per hour on the HOT150 page and the HWT-F1000S sheet.
Skip it if you want cold filtered water from the same tap: that is the HC250.
InSinkErator HC250 hot and cold: buy it or skip it?
Buy it if one hole has to deliver both near-boiling water and a filtered cold stream. The HC250 product page prints the same 750 W, 2/3-gallon tank and 1-3/8 in hole, a cold tap it calls filter-ready with an optional InSinkErator filter, ADA compliance, NSF/ANSI/CAN 372 and 61 and the 3-year warranty.
The flaw is the second supply: the cold side needs its own T fitting on the cold line, and the manual lists the filter at 100 F maximum, on the cold supply only, with a cartridge change every 6 months.
Skip it if the cabinet already holds a dedicated drinking-water filter: the under-sink filter review covers units with printed NSF/ANSI 42 and 53 listings, which the HC250’s optional filter does not carry for this model. On city water, the chlorine and chloramine guide explains what a carbon cartridge is and is not rated for.
InSinkErator HWT-F1000S tank with filter: buy it or skip it?
Buy it if an InSinkErator dispenser tap is already on the sink and only the tank has failed. The HWT-F1000S submittal sheet prints a 2/3-gallon stainless tank dispensing 60 cups of 200 F water per hour, 115 V, 750 W, 160 F to 210 F, 30 to 80 psi, NSF/ANSI 372, and a warranty of 3 years on the tank and 1 year on the filtration system; the F-1000S reduces particulates and chlorine taste and odor.
The flaw is compatibility: the sheet lists it for InSinkErator instant hot dispensers excluding the Hot1 and Hot100, so check the tap’s model before ordering. If the tap is filter-ready and the tank is fine, the F-1000S filtration system is the add-on on its own.
Skip the filter claim for lead: the F-2000S sheet prints NSF/ANSI 42 and 53 testing only in the GN1100, HC1100, GN2200, HC2200, GN2215, HC2215, H3300 and HC3300 systems, and names neither the HOT250 nor the HOT150.
Moen IH2300 and SIP faucet: buy it or skip it?
Consider it if the kitchen is Moen and a lower ceiling suits you. Moen’s IH2300 specification sheet prints a 5/8-gallon stainless tank, 40 cups per hour, 140 F to 190 F, 1500 W at 120 V, a 35 in cord with the tank within 30 in of the outlet, third-party certification to UL499 and CSA C22.2 64, ASSE 1023 conformance and a 1 year limited warranty. It pairs with the IH7600, IH7620 and IH7660 open-vent faucets, sold separately.
The flaw is twice the wattage for a smaller tank and a 190 F ceiling, 20 F below InSinkErator’s. The tank was listed as scarce on Amazon on 2026-10-09, so it carries no button here; re-check stock before ordering a faucet that needs it.
Count the hole and the outlet before you buy
Do not order a dispenser until two facts are confirmed: a spare deck hole of 1-3/8 in (the HOT250 and HOT150 sheets) and a grounded GFCI outlet in the cabinet that is not on the disposer’s switch (the HOT250 manual). If the real complaint is that the kitchen faucet takes a minute to run hot, the hot water wait time calculator and the recirculation options guide solve a different problem for less.
What goes wrong?
The tank leaks. The HOT250 manual says the tank has a limited life like any water heater and advises a drain pan or leak detector where leakage could damage property; the disposal leak guide shows what water under a sink cabinet does to the floor of it.
It boils. The thermostat runs to 210 F, and the manual says not to let the unit boil continuously; set it back from the 200 F pre-set if the spout spits steam.
It is cold at first. The HOT250 manual allows 16 to 20 minutes from first power-up to temperature, and a tank on a switched outlet starts over every time the switch is thrown.
The filter is forgotten. Every 6 months on the HOT250 manual, cold line only, with 0.75 gpm and a 500-gallon capacity printed on the F-2000S sheet.
Frequently asked questions
Does an instant hot water dispenser need its own outlet?
InSinkErator's HOT250 manual requires a grounded GFCI outlet under the sink that is powered continuously, on a 15 amp circuit at 120 V, and not on the same wall switch as the disposer unless a SinkTop Switch is fitted. Moen's installation article asks for a 15 or 20 ampere fused grounded supply, not switch-controlled, and recommends a separate circuit.
What size hole does an instant hot water tap need?
InSinkErator's HOT250 spec sheet and the HOT150 submittal sheet both require a standard 1-3/8 in sink hole; the manual says to cut one with a 1-3/8 in to 1-1/2 in hole saw or to reuse a sprayer hole with the hose line plugged. Counter thickness is capped at 2 in on the HOT150 sheet and 3 in on the HOT250 sheet.
How hot does an instant hot water dispenser get?
InSinkErator's HOT250 spec sheet prints a thermostat adjustable from 160 F to 210 F, factory pre-set at 200 F, and the manual says the near-boiling water can scald on contact. Moen's IH2300 sheet prints 140 F to 190 F. The HOT250 manual allows 16 to 20 minutes for the tank to reach temperature after first start.
Can you add a water filter to an instant hot dispenser?
On the HOT250 and HC250, yes: the manual lists an optional InSinkErator F1000S or F2000S filter on the cold supply line only, with a 100 F maximum water temperature and a cartridge change every 6 months. The F-2000S sheet prints NSF/ANSI 42 and 53 testing only for older GN, HC and H3300 series systems, so no certification is claimed here for the HOT250.
How long is the warranty on an instant hot water dispenser?
The makers print it. InSinkErator's HOT250 spec sheet lists a 3-year in-home limited warranty covering parts and labor; the Invite HOT150 sheet lists 1 year in-home. The HWT-F1000S sheet splits it: 3 years on the tank, 1 year on the filtration system excluding the cartridge. Moen's IH2300 sheet lists a 1 year limited warranty.
Fact sheet and how to cite this page
- Answer
- With a free 1-3/8 in sink hole and a grounded GFCI outlet under the sink, the pick is the InSinkErator HOT250: its spec sheet prints 750 W, a 2/3-gallon tank, 160 to 210 F and a 3-year in-home warranty. The Invite HOT150 is the same 750 W, 2/3-gallon tank with a 1-year warranty and a 2 in counter limit. Moen’s IH2300 prints 1500 W, 140 to 190 F and 40 cups per hour.
- Comparison basis
- InSinkErator’s HOT250 spec sheet WDT586-23D and installation manual, the Invite HOT150 submittal sheet and product page, the HWT-F1000S and F-2000S submittal sheets, Moen’s IH2300 specification sheet and installation article, compared on tank size, wattage, temperature range, cups per hour, sink hole, counter thickness, supply pressure, filter option, printed standards and warranty years.
- Assumptions
- A free sink hole of 1-3/8 in and a grounded GFCI outlet under the sink already exist; adding either is a plumber’s or electrician’s job and is priced before the dispenser
- Cups per hour is printed only where the maker prints it: the HOT150 page and the HWT-F1000S sheet say 60, Moen’s sheet says 40, and the HOT250 documents print no figure
- Waste King and Franke have no maker spec sheet that could be opened this session, so neither appears in the table
- Method
- OwnerSpec compared manufacturer-published specifications read on 2026-10-09 and confirmed each listed ASIN in stock the same day; it did not install, run or use any dispenser, invents no test, and reports only the figures the cited document states.
- Primary source
- InSinkErator, HOT250 hot and cold specification sheet WDT586-23D (manufacturer or vendor document)
- Facts verified
- Last updated
- Cite as
- OwnerSpec, "Best instant hot water dispenser: the maker spec sheets sort InSinkErator and Moen by tank, wattage, temperature ceiling and warranty years, and a free sink hole plus an outlet decides before any of that", https://ownerspec.com/plumbing/reviews/best-instant-hot-water-dispenser/, facts verified 9 October 2026.
Every figure above also appears, with its source, in the article. All sources ยท How OwnerSpec verifies numbers
Sources
- InSinkErator, HOT250 hot and cold specification sheet WDT586-23D (manufacturer or vendor document)
- InSinkErator, HOT250 installation, care and use manual (manufacturer or vendor document)
- InSinkErator, HOT250 hot-only product page (manufacturer or vendor document)
- InSinkErator, HC250 hot and cold product page (manufacturer or vendor document)
- InSinkErator, Invite HOT150 submittal sheet H-HOT150 (manufacturer or vendor document)
- InSinkErator, Invite HOT150 product page (manufacturer or vendor document)
- InSinkErator, HWT-F1000S instant hot water tank and filtration system submittal sheet (manufacturer or vendor document)
- InSinkErator, F-2000S Filtration System Plus submittal sheet (manufacturer or vendor document)
- Moen, IH2300 Instant Hot Tank specification sheet (Rev. 12/24) (manufacturer or vendor document)
- Moen Solutions, Instant Hot Tank: installing the tank in the correct position (manufacturer or vendor document)
- Moen Solutions, Instant Hot tanks and SIP faucets overview (manufacturer or vendor document)
- Moen, IH7660 Sip Modern instant hot faucet page (manufacturer or vendor document)