Our take
Consider MT4155SPS if you want a Whirlpool countertop microwave with a documented 1.5-cu.-ft. capacity and sensor-related functions listed in the family use-and-care guide. Several exact-suffix specifications remain unsettled, so verify output, finish, and any installation kit on a trustworthy model-specific document before relying on them.
A documented 1.5-cu.-ft. Whirlpool countertop model when its specific listing can be confirmed.
This is not the safest choice for a buyer who needs a fully corroborated wattage, finish, turntable diameter, or exact trim-kit compatibility before ordering.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Whirlpool's support page identifies the exact MT4155SPS model as a 1.5-cu.-ft. countertop microwave.
- The MT4155SP family guide documents sensor cooking, sensor reheat, sensor popcorn and warm-hold functions.
- The family dimension guide supplies counter clearances and physical dimensions for installation planning.
What to weigh up
- The 1,200-W historical title claim is not separated into cooking output versus electrical input by the reviewed source.
- The exact suffix's finish and turntable diameter remain unconfirmed in the reviewed Whirlpool documents.
- Family-level trim-kit information does not prove a specific kit fits this suffix and opening.
The key details
| Model covered | MT4155SPS |
|---|---|
| Capacity | 1.5 cu. ft. |
| Microwave output | Microwave output not separately verified |
| Cooking approach | Family manual documents sensor cooking, defrost and warm hold |
| Installation options | Countertop; family guide also discusses approved trim-kit installation |
| Finish and turntable | Exact finish and turntable diameter not independently confirmed |
Performance figures are manufacturer claims. Source checked October 4, 2026. Regional models and included accessories can differ.
What the features mean for you
A useful capacity with an evidence boundary
Whirlpool's exact MT4155SPS support record identifies the model as a 1.5-cu.-ft. countertop microwave. That gives shoppers a solid starting point for comparing cavity volume with compact 0.8- and 1.2-cu.-ft. models. Capacity still does not settle whether a favorite platter fits, and the available Whirlpool dimension guide should be checked for external installation measurements rather than inferred from the volume. The historical source title mentions stainless steel and 1,200 watts, but the exact current product evidence reviewed here does not independently confirm the finish or clarify whether that wattage is cooking output or input. Those points stay out of the matcher's verified values until a clearer model-specific source is available.
The family manual gives sensor controls useful context
The Whirlpool use-and-care guide for the MT4155SP family lists sensor cooking, sensor popcorn, sensor cook, sensor reheat, automatic defrost, and warm hold. The exact MT4155SPS model support record points to the family documentation, and the historical exact-model title also names sensor cooking. This is enough to describe the documented control family, while keeping the source relationship visible. It is not a report of performance in every food or household. The manual's descriptions can help a buyer see whether the control approach is relevant; they cannot guarantee that a preset will replace checking the food or following package directions. If a feature must be supported for the precise suffix, read the exact appliance's own instructions before purchase.
Do not treat an unlabeled wattage as output
A 1,200-watt number appears in the frozen historical title, but the model-specific Whirlpool evidence reviewed for this draft does not establish what that number measures. Microwave output and electrical input are different specifications. We leave output unknown rather than converting an ambiguous listing figure into a manufacturer-confirmed cooking rating. That limits the model's comparison on a common performance-related dimension, but it is the honest reading of the evidence available. If output is important to you, ask for the rating plate or an exact manual/specification source that labels the value. Until then, compare the documented capacity and features without making a speed prediction from the title.
Plan counter placement from the family dimension guide
Whirlpool identifies the MT4155SP family as countertop microwave ovens and publishes dimensions and ventilation clearance guidance. That supports its category placement and gives a way to plan an ordinary counter location. The same family material also discusses built-in trim-kit use with approved ovens. Because the exact trim compatibility for MT4155SPS was not resolved from the reviewed documents, treat that as an installation question to verify rather than a confirmed benefit for this suffix. Use the exact model number and kit documentation to check the required opening, clearances, and paired appliance. Do not assume that a family guide makes any microwave suitable for a cabinet enclosure.
Choose it when the known features are enough
MT4155SPS may make sense for a buyer who wants a 1.5-cu.-ft. Whirlpool counter model and is comfortable checking several details against the current listing or manual. It is a weaker pick for someone who needs every specification settled before narrowing the field. Finish, exact sensor feature mapping, output, and optional kit compatibility should not be silently filled from a related code. The reviewed Whirlpool sources do not classify this model for commercial foodservice use, so confirm the intended duty with the manufacturer if it will serve a shared-use site. The purchase link therefore uses a tagged search for the exact Whirlpool model rather than the unverified historical ASIN. Read the current product label carefully and make sure it says MT4155SPS; a similar family code does not establish that its features transfer unchanged.
What else to compare
The Frigidaire Professional models have clearer output and trim-kit documentation, at larger capacities. The Sharp R-220KW is smaller and its exact family manual supports its output and turntable facts, while the Kenmore 69123 remains a compact-capacity option with different evidence limitations.
Before you buy
Is the MT4155SPS a countertop microwave?
Yes. Whirlpool's exact support record and the MT4155SP family dimension guide identify it as a countertop microwave model.
Is its microwave output confirmed as 1,200 W?
Not from the reviewed manufacturer documents. The historical title's wattage is not labeled clearly enough to use as cooking output.
Does every MT4155SP trim kit fit MT4155SPS?
The family guide discusses approved trim-kit installations, but exact suffix and opening compatibility should be checked in the kit's own instructions.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Whirlpool MT4155SPS product support and family documents ↗ — checked October 4, 2026.
- Whirlpool MT4155SPS Owner's Center ↗ — checked October 4, 2026.
- Whirlpool MT4155SP family dimension guide ↗ — checked October 4, 2026.
- Whirlpool MT4155SP family use and care guide ↗ — checked October 4, 2026.
The decision
MT4155SPS has a documented 1.5-cu.-ft. countertop identity and family-level sensor cooking guidance. Keep it in consideration if those meet your needs, but confirm the exact finish, output rating, and any trim-kit plan from suffix-specific documents before buying.
Is it the right fit?
Check the exact model and today’s offers on Amazon.