Every baby bottle needs sterilising for at least the first year. What changes between a £23 steriliser and a £299 one isn't how clean the bottle gets — it's how much you still have to do yourself, how many bottles fit, and how long they stay sterile once the cycle ends.
Step 1. The Real Split Is Whether It Washes, or Only Sterilises
A microwave or electric steam steriliser only sterilises. You still hand-wash every bottle, teat and ring with a brush first, then load them in. An all-in-one unit like the Bebello 4-in-1 runs a wash cycle (around 19 minutes) before the sterilise cycle (around 10 minutes), so bottles go from used to sealed-sterile without a bottle brush. That single difference — washing by hand or not — is most of what the price gap pays for.
Decide first whether you're willing to keep washing bottles by hand. Everything else about the choice follows from that answer.
Step 2. Count the Capacity Against How Many Feeds You Actually Do
Microwave sterilisers are the smallest, typically holding four to six bottles. Electric steam units do around six — the Tommee Tippee electric steriliser sterilises six bottles in under eight minutes. The Bebello holds up to eight bottles, or a full set of breast pump parts. A newborn on eight or more feeds a day, especially with expressed milk in the mix, means a six-bottle steriliser runs twice a day; a larger drum means one cycle.
Match capacity to your feeds per day, not to the lowest price — a drum that's too small just means running more cycles.
Step 3. Check How Long Contents Stay Sterile After the Cycle
A microwave steam steriliser keeps its contents sterile only while the lid stays shut, and only for a limited window — open it and the clock resets. Electric units work the same way. The Bebello holds sterility for 72 hours by circulating HEPA-filtered air inside the sealed drum, so a full load done on a Sunday is still sterile mid-week.
If you sterilise a batch at a time rather than one bottle per feed, the hold time matters as much as the cycle time.
Step 4. Kitchen Space and Setup Are the Practical Limits
A microwave steriliser needs a microwave with enough clear internal space — a genuine constraint in a small kitchen, and it ties up the microwave during the cycle. An electric steriliser is a permanent countertop item roughly the size of a kettle. The Bebello is 26 x 33 x 41cm and 6.5kg — closer to a small worktop dishwasher — but needs no plumbing, just a drain tube run into the sink.
Measure the counter space (or the inside of your microwave) before buying. The all-in-one units are appliance-sized, not gadget-sized.
Step 5. What Goes In Besides Bottles
All three types handle bottles, teats and rings. The Bebello also takes dummies, sippy cups and breast pump components, and lists compatibility with Elvie, Haakaa and Medela pump sets. Pump parts need sterilising as often as bottles, so if you're expressing, that compatibility is worth checking rather than assuming.
If you're combination feeding or exclusively pumping, confirm pump-part compatibility explicitly — not every steriliser fits every pump.
Step 6. Running Costs Are Small — the Upfront Price Is the Real Difference
Microwave sterilising borrows a few minutes of your microwave's power. Electric steam units use a little mains electricity and tap water per cycle. The Bebello draws up to 630W and uses about 2.2 litres of water per wash plus 0.2 litres per sterilise. None of these are expensive to run day to day.
Don't over-weight running costs. The meaningful difference between these is the price on the box, not the cost of a cycle.
Quick Picks by Budget
Budget: Tommee Tippee Microwave Steam Steriliser — £22.95, sterilises 4-6 bottles, no appliance footprint.
Mid-range: Tommee Tippee Electric Steriliser — £54.95, a permanent countertop unit for six bottles.
All-in-one: Bebello 4-in-1 — £299, washes and sterilises without hand-scrubbing first.