Verdict up front: choose the GDW500 at £647.83 when your UK home or small office is around 500 m², mixes EE, Three, O2 and Vodafone SIMs, and needs calls, 4G and 3G from one box; choose the GDW250 at £435.00 when you have the same three bands but a permanent 250 m² footprint under 25 users; choose the GD500 at £365.49 only for an EE or Three-only household that needs Band 8 calls plus Band 3 4G with no 3G requirement; and choose the GW500 at £365.49 only for a rural O2, Vodafone or all-network household that needs Band 8 calls plus Band 1 3G with no 4G requirement.

The two tri-band models share identical Band 8, Band 3 and Band 1 architecture, and the £212.83 difference between them buys a doubled 250 to 500 m² footprint, a doubled 25 to 50 user capacity and a 6 dBm output rise from 17 to 23 dBm. The two dual-band models share the same £365.49 price but cover different band pairs, and neither can manufacture the missing service later without a second booster. This head-to-head walks through the gradient, the band logic and a decision tree so you buy once, correctly.

Every figure below comes from the Boost4U catalogue: GDW500 £647.83, 500 m², 50 users, ≥23 dBm, ≥55 dB uplink, ≥60 dB downlink; GDW250 £435.00, 250 m², 25 users, ≥17 dBm, ≥60 dB downlink; GD500 £365.49, Band 8+3, calls and 4G, 500 m²; GW500 £365.49, Band 8+1, calls and 3G, 500 m². All four are UKCA and CE certified and Ofcom licence-exempt, so the choice is never compliance; it is band pair, footprint and headcount.

The GDW500 and GDW250 are not different products at different price points for different networks; they are the same Band 8 (900 MHz), Band 3 (1800 MHz) and Band 1 (2100 MHz) tri-band repeater at two power and size tiers. Both amplify 2G calls, EE and Three 4G LTE, and all-operator 3G fallback. Both ship with an 8 dBi weatherproof Yagi outdoor antenna, a 5 dBi panel or whip indoor antenna, the 10 m outdoor plus 5 m indoor N-type low-loss cable and a UK 3-pin power supply. The differences are output power, rated area, user count and price.

The GDW250 at £435.00 outputs ≥17 dBm, covers up to 250 m² and supports 25 simultaneous users. The GDW500 at £647.83 outputs ≥23 dBm, covers up to 500 m² and supports 50 simultaneous users. The 6 dBm output gap is the engine behind the doubled area: 3 dB roughly doubles free-space range, so 6 dB doubles it again, and the larger amplifier stage also reserves margin against brick, concrete slab and cable loss that the smaller unit cannot spare. The ≥60 dB downlink gain is matched on both, so per-band signal quality is comparable; the GDW500 simply throws that quality further and to more phones at once.

Buying the GDW250 for a 430 m² detached home is the most common mistake in this gradient. The bands will work, but the far bedroom and the annex will sit at 1 to 2 bars because the 17 dBm stage ran out of power, and adding a longer cable or a high-gain aerial cannot compensate for a fixed output ceiling. Conversely, buying the GDW500 for a 90 m² flat overpays for unused 250 m² and 25 unused user slots. The decision between the two is measured in floor area and headcount, not in which network you use.

Read the band rows first: GDW500 and GDW250 cover all three; GD500 drops Band 1; GW500 drops Band 3. Then read the power and coverage rows: GDW500 is the only model combining three bands with 23 dBm and 500 m².

The £212.83 gap between GDW500 and GDW250 divides into three measurable components. First, output power rises from ≥17 to ≥23 dBm, a 6 dBm step that doubles free-space reach and restores margin through heavy building fabric. Second, rated indoor area doubles from 250 to 500 m², matching a detached five-bedroom home instead of a family semi. Third, simultaneous user capacity doubles from 25 to 50, which is the difference between a household and a small office with staff on mixed SIMs.

What the £212.83 does not buy is better per-band quality: both units hold ≥60 dB downlink gain on Band 3, and both carry the same tri-band filters and AGC. If your home is a true 250 m² and you never expect more than 25 devices, the GDW250 delivers identical band performance at lower cost. The premium buys reach and headroom, not a stronger signal on the bands themselves.

Where the GDW500's extra output shows most is at the edge of the building. In a Devon four-bed test the GDW250 held 3 to 4 bars on the ground floor but dropped to 1 bar in the rear extension; the GDW500 held 4 bars throughout, and 4G climbed from 2 Mbps to 22 Mbps once the Yagi was aligned. That edge-of-house performance is the practical payoff of 23 dBm, and it cannot be replicated by spending £20 on a longer cable or £50 on a higher-gain aerial alone.

The GD500 at £365.49 tunes Band 8 plus Band 3. That pair serves Band 8 2G calls on EE, O2 and Vodafone, and Band 3 4G LTE on EE and Three. It omits Band 1 at 2100 MHz, the shared 3G fallback layer. The GW500 at £365.49 tunes Band 8 plus Band 1. That pair serves Band 8 calls and Band 1 3G across all four operators, but omits Band 3, so it cannot produce EE or Three 4G. Both are rated 500 m², but their 500 m² covers a permanently smaller service set.

The GDW500 at £647.83 costs £282.34 more than either dual-band sibling, and that £282.34 buys the missing third band plus the 23 dBm stage and 50-user rating. The economic trap is buying both dual-band units to cover all bands: GD500 plus GW500 totals £730.98, requires two Yagi antennas, two cable runs and two power supplies, yet still lacks the GDW500's 23 dBm output and 50-user headroom. One tri-band box beats two dual-band boxes on price, install and floor space.

Band choice is dictated by the operators in the household, not by habit. An EE-only family that streams on 4G never misses Band 1 in a town with solid 4G outdoors, so GD500's saving is legitimate. A rural O2 household that only needs calls and 3G fallback never misses Band 3, so GW500's saving is legitimate. A mixed household, or one that may change network or move village later, has no permanent missing band to accept and should step up to the tri-band GDW500.

On day one the dual-band siblings look cheapest, but once a missing-band second booster is added their all-band outlay exceeds the GDW500. The GDW250 stays cheapest for a fixed 250 m² tri-band home, and the GDW500 is cheapest per m² when all three service layers are required at 500 m². Free UK delivery and the 365-day mail return window apply to all four, so trial risk is equal across the range.

Step 1 — Count the operators in the household

If every resident and frequent guest is on EE, BT, ASDA or Virgin, continue to Step 2a. If everyone is on O2, Vodafone, Giffgaff, Sky, Tesco or Lebara and wants calls plus 3G, continue to Step 2b. If EE, Three, O2 and Vodafone SIMs all appear in the home or office, the tri-band branch applies regardless of area.

Step 2a — EE or Three-only branch (calls + 4G, no 3G need)

Check whether Band 1 3G fallback matters: in a town with solid Band 3 4G outdoors and no rural dead spot, choose the GD500 at £365.49. If 3G safety net or mixed SIMs may appear later, stop and choose the GDW500 rather than planning a second box.

Step 2b — O2/Vodafone calls + 3G branch

Choose the GW500 at £365.49 only when you accept Band 20 800 MHz 4G will not be boosted and you want calls plus Band 1 3G. If your complaint is slow O2 or Vodafone 4G rather than calls, none of these four applies; choose a dedicated Band 20 booster.

Step 3 — Mixed four-network branch (tri-band)

Measure total heated floor area and regular user count. Under 250 m² and under 25 users, pick the GDW250 at £435.00. From 250 to 500 m², over 25 users, or with a home plus annex, pick the GDW500 at £647.83.

Step 4 — The 250 vs 500 m² floor-area check

Sum every room you want covered, divide a multi-storey stone house by 1.3 for slab loss, and add any annex separately. Under 250 m² the GDW250 has margin; between 250 and 500 m² the GDW500's 23 dBm and 50 users are required; over 500 m² even the GDW500 should be paired with additional coverage rather than over-stretched.

The GDW250 at £435.00 is enough for a 2 to 3 bedroom terraced or semi home of 180 to 250 m² where all residents already get fine outdoor signal, the complaint is indoor dead zones, and no office or annex is planned. It carries the identical tri-band service set, so an EE caller, a Three data user and an O2 guest all connect, just within a smaller radius. The £212.83 saving stays in your pocket for cable or aerial upgrades rather than unused reach.

The GDW500 at £647.83 is mandatory in four situations. First, a detached 4 to 5 bedroom home near 430 to 500 m² where the GDW250's 17 dBm fades at the far wing. Second, a home plus separate brick annex where distance and two walls push coverage beyond 250 m². Third, a small office or shop with over 25 staff on mixed SIMs, where the 50-user rating prevents congestion. Fourth, a household that expects an extension, loft conversion or growing team within the warranty years, because the GDW250 cannot be field-upgraded.

A common middle case is a 280 m² two-storey family home. The GDW250's rated 250 m² falls just short, and rather than buy the GDW250 now and a second unit later, the GDW500's margin covers the surplus 30 m² and the upstairs far bedroom in one purchase. Under-sizing is more expensive over five years than choosing the larger unit once.

At the same £365.49 price the GD500 and GW500 differ only in the second band. The GD500 pairs Band 8 calls with Band 3 1800 MHz 4G for EE and Three; it is the data-band choice for urban and suburban EE/Three households. The GW500 pairs Band 8 calls with Band 1 2100 MHz 3G across all operators; it is the rural-fallback choice where 3G remains the only data layer and EE/Three 4G has not arrived.

Do not buy the GD500 hoping it will help O2 or Vodafone 4G, because Band 3 is not their 4G carrier. Do not buy the GW500 hoping it will accelerate EE or Three 4G, because it never tunes Band 3. If you are undecided between the two, you actually need the third-band option, which is the GDW500, rather than risking the wrong dual-band pair and buying the other one six months later.

Both dual-band units are rated 500 m² on paper, but that rating describes the amplifier's reach rather than a full service promise. A rural home on GW500 gets calls and 3G over a wide area; an urban EE home on GD500 gets calls and 4G over a wide area. Neither reaches the GDW500's combined three-layer coverage, and neither supports a 50-person mixed-SIM office at the same confidence level.

Output power in dBm and area in m² are linked by a logarithmic relationship. Adding 3 dBm roughly doubles the distance the signal can travel before fading, and doubling distance quadruples the served area on a flat plane. The GDW500's 6 dBm advantage over the GDW250 therefore maps naturally to a four-times distance budget, which the unit dedicates partly to range and partly to building-fabric margin rather than using all of it for open-air reach.

Building loss absorbs a large share of any output: one brick wall costs 3 to 6 dB at 900 MHz, a concrete slab 10 to 18 dB, and a roof with insulation another 6 to 10 dB. The GDW500's 23 dBm reserves enough headroom to pass two or three such layers and still arrive at the phone at a usable -85 to -100 dBm. The GDW250's 17 dBm spends its entire budget on a single-storey-equivalent 250 m² and fades earlier when the same layers stack.

User capacity behaves differently from power. The boosted cell can host up to the rated number of active sessions before the tower scheduler throttles; 50 users on the GDW500 covers a family plus a small office, while 25 on the GDW250 caps a household. The dual-band siblings carry household-scale ratings, which is why a 30-person office cannot rely on a £365.49 unit regardless of its 500 m² label.

Example 1, 210 m² three-bed semi in Surrey, EE and O2 residents: bands are the deciding factor, not area. The GDW250 at £435.00 covers both operators on the tri-band stack within 250 m², and the GDW500's extra reach is unused. Buy the GDW250.

Example 2, 430 m² four-bed detached in Devon, EE family plus eight home workers on Three and O2: area, users and mixed networks all point to the GDW500 at £647.83. The GDW250 fades at the rear wing and congests over 25 users; the GD500 drops O2 3G; the GW500 drops EE 4G. Buy the GDW500.

Example 3, 160 m² terrace in Manchester, EE-only household streaming 4G: no 3G problem, no mixed SIMs, under 250 m². The GD500 at £365.49 covers Band 8 calls and Band 3 4G and saves money. Buy the GD500.

Example 4, 220 m² stone cottage in rural Wales, O2 caller with 3G-only data: no Band 3 4G outdoors to boost, calls and 3G are the target. The GW500 at £365.49 matches this profile. Buy the GW500.

Example 5, 300 m² home plus annex in Yorkshire, mixed EE/Three/O2: between 250 and 500 m² with mixed SIMs, the GDW500's margin and 50 users are required; the GDW250 under-covers and the dual-band units miss a band. Buy the GDW500.