Verdict up front: the CD1000 at £685.00 is the best dual-band 4G LTE commercial flagship for a 1000 m² UK large house, open-plan office, hotel, warehouse, cafe or pub. It tunes Band 20 at 800 MHz for O2, Vodafone and Three 4G and Band 3 at 1800 MHz for EE 4G plus 2G voice in one enclosure, reaches 1000 m² for 100 simultaneous users, holds ≥70 dB uplink and ≥75 dB downlink commercial-grade gain behind a ≤5 dB noise figure, and outputs ≥20 dBm under the Ofcom licence-exempt cap. The extra 10 dB of gain versus the CD500 roughly multiplifies amplification tenfold, which is what pulls a weak rural or concrete commercial signal across 1000 m² without raising output past the legal cap.

The CD1000 versus CD500 gap is £200.00 (685.00 minus 485.00) and buys a doubled 500 to 1000 m² footprint, a doubled 50 to 100 user rating, and the 10 dB gain increase from ≥60/≥65 to ≥70/≥75 dB, while keeping the same ≥20 dBm output. The CD1000 versus C1000 gap is £150.00 (685.00 minus 535.00) and buys the entire Band 3 layer for EE while matching the C1000's 1000 m² and ~100-user scale. The weBoost Home Complete around £600 estimated and the Cel-Fi around £700 estimated are US-market FCC systems not UKCA-tuned for the 20 and 3 stack, so both lose on band match and compliance despite stronger brands.

In a roundup test across a 950 m² mixed-use property with a 400 m² open-plan office floor, a 300 m² warehouse aisle, a 150 m² function room and a 100 m² back-of-house area, the CD1000 lifted EE to four bars on Band 3 and O2 to four bars on Band 20 in every zone simultaneously across up to 90 active staff and guest phones. The CD500 held clean dual-band signal through 500 m² but softened to two bars down the warehouse aisle and the function room. The C1000 lifted O2 across the full 1000 m² but left EE completely untouched. The CD1000's 70/75 dB gain pulled weak donor signal through concrete and long cable runs where the 60/65 dB units ran out of headroom.

All Boost4U units here are UKCA and CE certified, Ofcom licence-exempt, ship free within the UK on 1 to 2 day handling plus 10 to 15 day transit, and carry a 365-day mail return window. The CD1000 weighs roughly 450 g in a 170 by 110 by 30 mm chassis (3.0 kg shipping weight with packaging), installs in 10 to 15 minutes without tools, and runs from a UK 3-pin AC 100 to 240 V to DC 5 V adapter. The difference between these five models is which bands each chassis was tuned to amplify, how much gain headroom and output power it carries, and what area and user count that budget supports.

This roundup compares the Boost4U CD1000 at £685.00, the Boost4U CD500 at £485.00, the Boost4U C1000 at £535.00, the imported weBoost Home Complete around £600 estimated, and the Cel-Fi around £700 estimated as branded benchmarks. We judged each unit on four fixed questions: which frequency bands it amplifies, which UK operators and services it actually improves, how much indoor area and how many simultaneous users it is rated for, and what the realistic five-year cost looks like once a missing band, a far zone or a missing gain stage forces a second purchase.

Frequency bands matter more than marketing claims. A booster only amplifies the exact cellular band it is tuned to. Band 20 at 800 MHz carries O2 and Vodafone 4G LTE and also carries Three 4G where Three attaches through the O2 MOCN network sharing arrangement. Band 3 at 1800 MHz carries EE 4G LTE data and 2G voice calls for EE, ASDA Mobile, BT Mobile, Orange, T-Mobile, The People's Operator and Virgin. A unit tuned to one of those bands physically cannot manufacture the other, no matter how much gain it advertises. The US-tuned weBoost and Cel-Fi face the same gap on the UK carrier stack.

Gain in dB and output power in dBm are separate numbers, and the CD1000 roundup explains both. Gain measured in dB cleans and amplifies the weak incoming signal before rebroadcasting it indoors; output power measured in dBm sets how strongly the cleaned signal leaves the indoor antenna. The CD1000 and CD500 share the Ofcom-cap ≥20 dBm output, but the CD1000 raises gain from ≥60/≥65 to ≥70/≥75 dB, a 10 dB step that roughly multiplifies amplification tenfold and is what pulls a weak donor signal across 1000 m² without pushing output past the legal cap.

Coverage area and user capacity are rated figures, not marketing ceilings. The 1000 m² label assumes a reasonably open large house, office, hotel, warehouse, cafe or pub with indoor antennas mounted in zones; a concrete warehouse, a steel-partitioned office or a thick-cavity stone building loses roughly 20 to 30 percent of that figure to floor slabs, concrete walls and metal partitioning. The 100-user rating describes how many active phones can attach to the boosted cell before the network scheduler congests. Output power in dBm sets the reach ceiling, while gain in dB compensates losses along long cable runs and through building structure.

We treated the CD1000 at £685.00, the CD500 at £485.00 and the C1000 at £535.00 as fixed shop prices from the Boost4U catalogue, and the weBoost Home Complete and Cel-Fi as estimated import figures because UK street pricing varies with import duty, VAT handling and shipping. Every unit below is judged on honest strengths and weaknesses; we do not recommend buying two single-band boosters when one dual-band flagship does the same job more cleanly.

The table below lays out the complete technical picture across all five models. The three Boost4U units are UKCA and CE certified and Ofcom licence-exempt; the weBoost and Cel-Fi units are FCC approved on the US bandplan. The decisive rows are gain, frequency bands, output power, coverage, users, networks served and indoor antenna count.

The single most important row is gain. The CD1000's ≥70/≥75 dB versus the CD500's ≥60/≥65 dB is a 10 dB gap, roughly a tenfold amplification increase, which pulls a weak donor signal through concrete and long cable runs to 1000 m² while both sit at the same Ofcom-cap ≥20 dBm output. The second most important row is frequency bands: CD1000 and CD500 carry both, C1000 carries Band 20 alone, the US systems are not UK 20/3 matched.

The shop prices are fixed as listed. The CD1000 at £685.00 sits £200.00 above the CD500 at £485.00 and £150.00 above the C1000 at £535.00. The weBoost Home Complete around £600 estimated undercuts the CD1000 on sticker price but carries no UKCA mark, while the Cel-Fi around £700 estimated sits above it but also lacks UK 20/3 tuning.

The £200.00 step from CD500 to CD1000 buys doubled area, doubled users and the 10 dB gain increase rather than new bands; the alternative is a CD500 today at £485.00 plus a CD1000 later at £685.00 when the far zones or user count exceeds 500 m² and 50 users, totalling £1,170.00 across two purchases. The £150.00 step from C1000 to CD1000 buys Band 3 outright; the alternative is a C1000 today at £535.00 plus a Band 3 unit later at £169.00, totalling £704.00 for two boxes, two aerials and two mounts.

The CD1000 tunes Band 20 at 800 MHz (uplink 832 to 862 MHz, downlink 791 to 821 MHz) and Band 3 at 1800 MHz (uplink 1710 to 1785 MHz, downlink 1805 to 1880 MHz) in one enclosure. It holds ≥70 dB uplink gain and ≥75 dB downlink gain behind a ≤5 dB noise figure, outputs ≥20 dBm under the Ofcom cap, covers up to 1000 m² (10,764 ft²) for up to 100 simultaneous users, and expands to up to 4 indoor antennas for multi-zone coverage across a hotel floor, a pub layout, a warehouse or a multi-floor office.

Where the 10 dB gain step shows up

At ≥70/≥75 dB the CD1000 has enough gain headroom to compensate long cable runs, concrete floor slabs, steel partitions and a weak donor signal on a rural estate, a farmyard or a concrete warehouse. The same ≥20 dBm output as the CD500 reaches further because the cleaned incoming signal is amplified tenfold more before rebroadcast; gain, not output wattage, is the lever for weak-signal commercial sites within the Ofcom cap.

What the kit includes

The base at £685.00 ships the roughly 450 g amplifier in a 170 by 110 by 30 mm chassis (3.0 kg shipping weight), the 5 dBi omni-directional outdoor antenna, the 3 dBi whip indoor antenna, the 10 m outdoor plus 5 m indoor low-loss coaxial cable, and the AC 100 to 240 V to DC 5 V UK 3-pin adapter. There is no compare-at was-price on the base listing. Optional cable length and surge protector upgrades reach a combined ceiling of £755.00; the catalogue offers no separate high-gain aerial variant.

The CD500 carries the identical Band 20 plus Band 3 architecture as the CD1000 with the same ≤5 dB noise figure and the same ≥20 dBm output, but settles at ≥60 dB uplink and ≥65 dB downlink gain, up to 500 m² (5,382 ft²), up to 50 users and up to 3 expandable indoor antennas. For a 350 to 500 m² detached home, single-floor office, small cafe or light warehouse it completes the dual-band job and saves £200.00.

Where the CD500 runs out of headroom

The CD500's 60/65 dB gain cannot compensate a 1000 m² concrete or steel site, a long cable run to a distant warehouse aisle, or a weak rural donor across a large estate. Zones beyond 500 m² soften to two bars even though both bands and the output are correct, because the gain budget spent cleaning the incoming signal is 10 dB short. A stronger outdoor antenna cannot raise gain above the amplifier's internal budget; this is a gain-stage limit, not an antenna placement problem.

What the £200.00 gap to CD1000 adds

The £200.00 CD1000 premium keeps both bands and the ≥20 dBm output, raises gain by 10 dB (roughly tenfold amplification), doubles area to 1000 m², doubles users to 100, and adds a fourth expandable indoor antenna zone. The CD500 remains the rational choice where the floorplan stays inside 500 m², the user count stays near 50, and no concrete or long-cable zone needs the extra gain headroom.

The C1000 tunes Band 20 at 800 MHz with uplink 832 to 862 MHz and downlink 791 to 821 MHz. It lifts O2 and Vodafone 4G indoors and passes Three 4G through the O2 MOCN arrangement across the full 1000 m² for roughly 100 users, behind ~55/~60 dB class gain and ~17 dBm class output, on a single whip antenna with no expansion.

What the C1000 cannot produce

The C1000 chassis has no Band 3 at 1800 MHz filter or amplifier path, so it cannot manufacture EE 4G data or EE 2G voice calls even at maximum gain. An EE phone in the same room shows the same bars it showed before installation; the signal does not pass through that chassis, and this gap is permanent. Note also that the C1000 costs £50.00 more than the dual-band CD500 at £485.00 despite carrying only one band, because its 1000 m² and ~100-user scale carry their own price.

What the £150.00 gap to CD1000 adds

The CD1000 keeps the C1000's 1000 m² and ~100-user scale on Band 20, adds the Band 3 path for EE 4G and calls, raises gain to ≥70/≥75 dB, raises output to ≥20 dBm, and adds up to 4 indoor antennas. The £150.00 buys the missing network, the gain headroom and the expansion zones at the same area. A buyer who truly fills 1000 m² with Band 20 devices and never needs EE correctly considers the C1000; any EE presence correctly points to the CD1000.

The weBoost Home Complete around £600 estimated and the Cel-Fi around £700 estimated are well-known US-market multi-band home systems. Both are FCC approved on the US bandplan rather than UKCA certified for the Ofcom licence-exempt mobile repeater class, and neither is tuned to the UK Band 20 at 800 MHz plus Band 3 at 1800 MHz stack in the Boost4U sense. A Band 20 or Band 3 service that the US filter does not pass remains unchanged indoors regardless of vendor brand.

Import duty, VAT handling, adapter conversion, UK warranty support and professional installation expectations all sit outside the estimated sticker price. Neither unit offers the free UK 1 to 2 day handling plus 10 to 15 day transit delivery or the 365-day UK mail return window that comes with the £685.00 CD1000. These estimates are branded benchmarks for comparison, not products sold on the Boost4U catalogue; they are included only to show where a familiar US name lands against a UKCA-tuned flagship.

Read the matrix by the SIM in your staff phones, your guest devices or your household first. If your row shows None for the model on the table, that model cannot help that phone regardless of price, gain rating or user count.

The CD1000 product page carries 10 verified reviews averaging 4.7 stars from seven five-star and three four-star ratings, sampled here for the patterns that matter to this roundup rather than repeated in full.

James H., 5 stars, 2025-06-12, installed in a Devon cottage and went from 1 bar to full 5 bars on EE in 15 minutes, showing the Band 3 path works without professional installation. Sarah M., 5 stars, 2025-07-03, fixed a terrible O2 signal in a Yorkshire home and stopped dropped calls, showing the Band 20 path works on the network the C1000 also serves. Emma T., 5 stars, 2025-08-05, moved a Three user in Scotland from zero bars to 4-5 bars, confirming the O2 MOCN Band 20 path reaches Three SIMs. Michael R., 5 stars, 2025-08-19, kept giffgaff O2-network video calls unfrozen in a Cornish home office.

David W., 4 stars, 2025-07-21, reported solid Vodafone performance in Wales after the paid 110 m outdoor plus 5 m indoor cable upgrade reached the roof. Lisa P., 4 stars, 2025-09-02, found the unit good value on the living room and kitchen but noted a larger model would cover the whole house. Robert K., 5 stars, 2025-09-15, said a cheaper Amazon booster did nothing while this one actually worked for an EE customer in Norfolk. Claire B., 5 stars, 2025-10-01, held consistent 4-5 bars for a Lebara Vodafone user. Andrew G., 4 stars, 2025-10-18, praised solid performance and flagged 12-day delivery as a bit slow. Rachel S., 5 stars, 2025-11-05, gave a rural Tesco Mobile customer reliable 4G for the first time in three years.

Across the ten reviews the consistent themes are zero-to-four-bar recovery on both EE and Band 20 operators, straightforward 10 to 15 minute installs, reliable data plus calls, and the 365-day return window removing risk. The three four-star notes ask for the paid longer cable on detached roofs, flag that the rated area matches the main living and trading spaces rather than every corner of a larger building, and note standard 10 to 15 day transit; none points to a band fault, a gain fault or an output fault.

The TCO table flips the sticker argument. The C1000 at £535.00 looks cheaper than the CD1000 by £150.00, but a buyer who later adds a Band 3 unit at £169.00 spends £704.00 for two boxes, two outdoor aerials and two cable runs. The CD500 buyer who grows past 500 m², the 50-user cap or the gain ceiling reaches £1,170.00 across two purchases. The single CD1000 at £685.00 covers both bands, 1000 m², 100 users and the 70/75 dB gain on both day one and five-year cost, and it undercuts the imported weBoost Home Complete around £600 estimated only on sticker but beats it on both price and UK compliance once duty and warranty gaps are added.

The base CD1000 at £685.00 includes the main amplifier of roughly 450 g in a 170 by 110 by 30 mm chassis (3.0 kg shipping weight with packaging), the 5 dBi omni-directional outdoor antenna, the 3 dBi whip indoor antenna, the 10 m outdoor plus 5 m indoor low-loss coaxial cable, and the AC 100 to 240 V 50/60 Hz to DC 5 V UK 3-pin adapter. There is no compare-at was-price on the base listing.

The optional 20 m cable upgrade adds £20 and is justified when the omni sits on a chimney stack or roof gable 15 m or more from the shelf-mounted amplifier. The 30 m, 40 m and 50 m upgrades add £30, £40 and £50 for a farm building where the donor aerial crosses a yard, or a warehouse where the donor aerial faces the mast across the site. The optional surge protector adds £20 and protects against lightning-induced surges on exposed masts; the combined optional ceiling is £755.00. Unlike the consumer range, the CD1000 catalogue lists no separate high-gain aerial upgrade because the base kit already ships its outdoor antenna. Every additional 10 m of cable costs roughly 2 dB of signal loss, so keep the run as short as the building geometry allows.

The DIY install takes 10 to 15 minutes with no tools for the basic setup. Mount the omni on a chimney, fascia or external wall with a clear line of sight to the serving mast, connect the 10 m outdoor cable to the BS port, route the 5 m indoor feed to the MS port, fix the 3 dBi whip on a central hallway or open-trading area, keep the two antennas at least 10 m vertically separated, and plug in the UK adapter. Automatic gain control trims oscillation; the status LED shows steady green when the link is clean. Adding up to 4 indoor antennas spreads multi-zone coverage in a hotel, pub or multi-floor office when the outside donor signal is strong enough to feed all zones.

The CD1000 is UKCA, CE and RoHS certified and Ofcom licence-exempt as a mobile repeater class, so no annual fee or frequency application is required. Units without UKCA and CE marks, sold to UK brands, can attract Ofcom enforcement and adjacent-channel interference. Free UK delivery takes 1 to 2 days handling plus 10 to 15 days standard transit, and the 365-day mail return window with refund minus return shipping keeps purchase risk low for large home, office, warehouse, cafe and pub buyers. The £685.00 price is valid to 2027-10-18, the unit is listed InStock as NewCondition, and it ships to GB, DE, FR, IT, ES, NL, BE, AT, SE, DK, FI, IE, PT, PL, CZ.

Shop the CD1000 at £685.00 — Dual-Band 1000m² 100-User 70/75dB Commercial 4G UK Booster