Filtriraj rezultate
360 W 540 W 2250 W 2300 W 2400 W 2406 W 2408 W 2500 W 2800 W 3000 W 3300 W 3500 W 4200 W 4500 W 5000 W 5500 W 5852 W 6000 W 7741 W 9000 W 12000 W 15000 W grijalice i radijatori
150 proizvoda
![Trotec uljni TDS 50 R, 9000 W](/slike/products/96/81/14838196/thumb80_trotec-uljni-tds-50-r_ef8d107c.jpeg)
Trotec uljni TDS 50 R, 9000 W
od 100,99 €
2
ponude
Stavi u listu želja
![Konvektor električni Technotherm CPH 2400 - s pločom za pohranu topline](/slike/products/28/77/24287728/thumb80_konvektor-elektricni-technotherm-cph-2400-s-plocom-za-pohranu-topline_4166194d.png)
1
ponuda
Stavi u listu želja
![RADIJATOR BUDERUS VK22 900/800](/slike/products/86/28/42042886/thumb80_radijator-buderus-vk22-900-800_a44e8a5c.jpeg)
RADIJATOR BUDERUS VK22 900/800
128,89 €
1
ponuda
Stavi u listu želja
![Blum Blum Rising Sun Zenith, infracrvena grijalica, 2500 W, IP34, daljinski upravljač, srebrna](/slike/products/80/64/19846480/thumb80_blum-blum-rising-sun-zenith-infracrvena-grijalica-2500-w_ef14d1cd.jpeg)
Blum Blum Rising Sun Zenith, infracrvena grijalica, 2500 W, IP34, daljinski upravljač, srebrna
od 129,90 €
2
ponude
Stavi u listu želja
![Trotec R 3050, 3000 W](/slike/products/20/07/14860720/thumb80_trotec-r-3050-000-w_1170bccf.png)
Trotec R 3050, 3000 W
od 110,99 €
2
ponude
Stavi u listu želja
![Bosch konvektorska HC 4000 - 500W, 500 W/5500 W](/slike/products/53/77/17677753/thumb80_bosch-hc-4000-500w-500-w_e9e48802.jpeg)
Bosch konvektorska HC 4000 - 500W, 500 W/5500 W
od 127,49 €
2
ponude
Stavi u listu želja
![Bonjour ERP 2500W električni konvektor](/slike/products/04/89/17808904/thumb80_bonjour-erp-2500w-elektricni-konvektor_f75182fb.jpeg)
1
ponuda
Stavi u listu želja
![Tesy konvektorska CN 03 250, 2500 W](/slike/products/61/95/5099561/thumb80_tesy-cn-03-250-2500-w-500-w_f55d2dec.jpeg)
Tesy konvektorska CN 03 250, 2500 W
od 99,00 €
2
ponude
Stavi u listu želja
![Zilan ZLN2229 2500 W](/slike/products/19/39/17643919/thumb80_zilan-konvektorska-zln2229-2500-w_d3341c12.jpeg)
Zilan ZLN2229 2500 W
47,66 €
1
ponuda
Stavi u listu želja
![Panel grijalica FG FS827](/slike/products/98/03/23540398/thumb80_panel-grijalica-fg-fs827_fc3ea058.jpeg)
Panel grijalica FG FS827
104,00 €
1
ponuda
Stavi u listu želja
![Trotec Dizajn konvektor TCH 2510 E](/slike/products/73/26/35652673/thumb80_trotec-dizajn-konvektor-tch-2510-e_f5609919.jpeg)
Trotec Dizajn konvektor TCH 2510 E
105,99 €
1
ponuda
Stavi u listu želja
![Tansun Monaco 3000W, 3000 W](/slike/products/95/07/7380795/thumb80_tansun-monaco-3000w-3000-w_6c802748.jpeg)
Tansun Monaco 3000W, 3000 W
od 1.025,00 €
3
ponude
Stavi u listu želja
![Floria Radijator uljni, 2500 W, 11 rebara - ZLN3666](/slike/products/94/13/19881394/thumb80_floria-radijator-uljni-2500-w-11-rebara-zln3666_d0d410aa.jpeg)
2
ponude
Stavi u listu želja
![Zilan uljni Floria ZLN3666 2500 W](/slike/products/48/02/27650248/thumb80_zilan-floria-zln3666_508ccb51.jpeg)
Zilan uljni Floria ZLN3666 2500 W
od 61,27 €
2
ponude
Stavi u listu želja
![KONVEKTOR TESY CN 031 250 EIS 2500W WI-FI](/slike/products/43/15/22951543/thumb80_tesy-cn-031-250-ei-cloud-w-wi-fi-elektricni-panel-radijator_e469d1a9.jpeg)
1
ponuda
Stavi u listu želja
![MASTER električni grijač B9 400V 800M3/H](/slike/products/14/32/51303214/thumb80_grijalice-i-radijatori-master-elektricni-grijac-b9-400v-800m3-h_96b213e.jpeg)
MASTER električni grijač B9 400V 800M3/H
od 279,00 €
2
ponude
Stavi u listu želja
![Grijalica sa halogenim ( kvarcnim ) grijačem, 2250 W, ZILAN , ZLN6845](/slike/products/09/49/51724909/thumb80_grijalice-i-radijatori-grijalica-sa-halogenim-kvarcnim-grijacem-2250-w-zilan-_624084d8.jpeg)
1
ponuda
Stavi u listu želja
![Trotec uljni TRH 23 E, 2500 W](/slike/products/28/99/14859928/thumb80_trotec-uljni-trh-23-e-2500-w_713dd363.png)
Trotec uljni TRH 23 E, 2500 W
od 65,99 €
2
ponude
Stavi u listu želja
![Rowenta grijalica SO2330F2, 2400 W](/slike/products/05/00/5090005/thumb80_rowenta-grijalica-so2330f2-2400-w_3f4a2819.jpeg)
Rowenta grijalica SO2330F2, 2400 W
od 42,00 €
4
ponude
Stavi u listu želja
![Blumfeldt Blumfeldt Smartwave, infracrveni grijač, karbonska cijev, 2400 W, WiFi, kontrola aplikacija, crna](/slike/products/60/53/21295360/thumb80_blumfeldt-blumfeldt-smartwave-infracrveni-grijac-karbonska-cijev_bf5fdd5f.jpeg)
Blumfeldt Blumfeldt Smartwave, infracrveni grijač, karbonska cijev, 2400 W, WiFi, kontrola aplikacija, crna
od 242,90 €
2
ponude
Stavi u listu želja
![Konvektor, električna panel grijalica, Electrolux, 2500W, WiFi, ECH/AG2-2500 3BE EEC](/slike/products/94/73/49377394/thumb80_grijalice-i-radijatori-konvektor-elektricna-panel-grijalica-electrolux_2fe384e8.jpeg)
1
ponuda
Stavi u listu želja
![Tristar KA5061, 3000 W](/slike/products/39/47/43854739/thumb80_tristar-ka5061-3000-w_50593c31.jpeg)
Tristar KA5061, 3000 W
77,99 €
1
ponuda
Stavi u listu želja
![Plinska grijalica YATO TYT-99730 15KW](/slike/products/58/38/50803858/thumb80_grijalice-i-radijatori-plinska-grijalica-yato-tyt-99730-15kw_fdfa1b1f.jpeg)
1
ponuda
Stavi u listu želja
![Zilan Grijalica sa halogenim ( kvarcnim ) grijačem, 2250 W - ZLN6845](/slike/products/65/00/36410065/thumb80_zilan-zln6845-kvarcna-grejalica-2250w_a5143ebf.jpeg)
5
ponuda
Stavi u listu želja
![Trotec TGH16E plinski grijač](/slike/products/24/83/51418324/thumb80_grijalice-i-radijatori-trotec-tgh16e-plinski-grijac_6dafbc3f.jpeg)
Trotec TGH16E plinski grijač
99,00 €
1
ponuda
Stavi u listu želja
![Floria Radijator uljni, 2500 W, 13 rebara - ZLN3673](/slike/products/97/13/19881397/thumb80_floria-radijator-uljni-2500-w-13-rebara-zln3673_2277b094.jpeg)
2
ponude
Stavi u listu želja
![Trotec uljni TRH 28 E, 2500 W](/slike/products/23/04/36370423/thumb80_grijalice-i-radijatori-trotec-uljni-trh-28-e-2500-w_219bb32b.jpeg)
Trotec uljni TRH 28 E, 2500 W
75,99 €
1
ponuda
Stavi u listu želja
![Klarstein Wonderwall 36, 360 W](/slike/products/05/90/7369005/thumb80_klarstein-wonderwall-36_f0dd96d2.jpeg)
Klarstein Wonderwall 36, 360 W
od 133,90 €
2
ponude
Stavi u listu želja
![TOO OFR-11-2500-121 2500W 11 član električni radijator ulje bijela / sivo](/static/slike/blank_150x150.jpg)
1
ponuda
Stavi u listu želja
![Zilan Grijalica sa halogenim ( kvarcnim ) grijačem, 2800 W - ZLN6838](/slike/products/39/69/25036939/thumb80_zilan-grijalica-sa-halogenim-kvarcnim-grijacem-2800-w-zln6838_8a66d654.jpeg)
1
ponuda
Stavi u listu želja
![Zilan uljni ZLN3673 2500 W](/slike/products/71/14/12781471/thumb80_zilan-uljni-zln3673-2500-w_7975e556.png)
Zilan uljni ZLN3673 2500 W
od 70,77 €
5
ponuda
Stavi u listu želja
![Tesy CN 04 250 EIS W, 2500 W](/slike/products/32/66/12506632/thumb80_tesy-cn-04-250-eis-w-2500-w_2935614.jpeg)
Tesy CN 04 250 EIS W, 2500 W
141,00 €
1
ponuda
Stavi u listu želja
![Rowenta grijalica SO9420F0, 2400 W](/slike/products/97/14/9561497/thumb80_rowenta-grelnik-so9420f0_ef946458.jpeg)
Rowenta grijalica SO9420F0, 2400 W
193,80 €
1
ponuda
Stavi u listu želja
![Klarstein uljni Thermaxx Heatstream, 2000 W/2500 W](/slike/products/76/53/27435376/thumb80_klarstein-thermaxx-heatstream_f75d44b1.jpeg)
6
ponuda
Stavi u listu želja
![Grijalica sa halogenim ( kvarcnim ) grijačem, ZILAN, 2800 W](/slike/products/39/06/51460639/thumb80_grijalice-i-radijatori-grijalica-sa-halogenim-kvarcnim-grijacem-zilan-2800-w_d690b1e2.png)
1
ponuda
Stavi u listu želja
![Zilan Uljni radijator Premium, 2500 W, 13 rebara - ZLN2135](/slike/products/83/51/56905183/thumb80_grijalice-i-radijatori-zilan-uljni-radijator-premium-2500-w-13-rebara-zln2135_a570f3e7.jpeg)
4
ponude
Stavi u listu želja
![Blum Blum Camden Heat, grijalica za terasu, IR, ComfortHeat, IP24, Easy, crna](/slike/products/41/64/19846441/thumb80_blum-blum-camden-heat-grijalica-za-terasu-ir_de958bdb.jpeg)
3
ponude
Stavi u listu želja
![NEDIS HTOI30WT11 Uljni radijator mobil 1000 / 1500 / 2500 W bijela](/static/slike/blank_150x150.jpg)
1
ponuda
Stavi u listu želja
![DELONGHI VBF plinske grijalice](/slike/products/73/80/28698073/thumb80_delonghi-vbf-plinske-grijalice_9b9b8700.jpeg)
DELONGHI VBF plinske grijalice
199,99 €
1
ponuda
Stavi u listu želja
![Konvektor električni Technotherm CVS 2501](/slike/products/13/77/24287713/thumb80_konvektor-elektricni-technotherm-cvs-2501_586cf316.png)
1
ponuda
Stavi u listu želja
![Electrolux Konvektor, električna panel grijalica, 2500W, WiFi - ECH/AG2-2500 3BE EEC](/slike/products/00/32/48083200/thumb80_electrolux-konvektor-elektricna-panel-grijalica-2500w_c754b32f.jpeg)
4
ponude
Stavi u listu želja
![BM2 EK 15 C električni grijač zraka](/slike/products/22/00/21330022/thumb80_bm2-ek-15-c-elektricni-grelnik_553fbe43.png)
BM2 EK 15 C električni grijač zraka
739,61 €
1
ponuda
Stavi u listu želja
![Enders plinska grijalica ECOPLUS](/slike/products/45/51/24375145/thumb80_enders-plinska-grijalica-ecoplus_53069b7.jpeg)
Enders plinska grijalica ECOPLUS
277,40 €
1
ponuda
Stavi u listu želja
![Trotec uljni TDS 75 R, 15000 W](/slike/products/93/81/14838193/thumb80_trotec-uljni-tds-75-r_d76ea612.jpeg)
Trotec uljni TDS 75 R, 15000 W
401,63 €
1
ponuda
Stavi u listu želja
![Trotec IRD 2400, 2400 W](/slike/products/44/07/14860744/thumb80_trotec-ird-2400-2400-w_8b819053.png)
Trotec IRD 2400, 2400 W
od 255,99 €
2
ponude
Stavi u listu želja
![Blum Blum CosmicBeam Plus XXL, infracrvena grijalica, 3000 W, IP44, daljinski upravljač, bijela](/slike/products/77/18/19791877/thumb80_blum-blum-cosmicbeam-plus-xxl-infracrvena-grijalica-3000-w_13e0175.jpeg)
Blum Blum CosmicBeam Plus XXL, infracrvena grijalica, 3000 W, IP44, daljinski upravljač, bijela
308,90 €
1
ponuda
Stavi u listu želja
![Blaupunkt HOR501 uljni radijator 22 m² 2500 W bijela, crna](/slike/products/87/52/18815287/thumb80_blaupunkt-hor501-oljni-radiator_1850f925.png)
1
ponuda
Stavi u listu želja
![Električni konvektor Electrolux ECH/BM-1600 3BI-W EEC](/slike/products/58/39/39903958/thumb80_elektricni-konvektor-electrolux-ech-bm-1600-3bi-w-eec_4fe0c846.jpeg)
2
ponude
Stavi u listu želja
![Trotec uljni TRH 27 E, 2500 W](/slike/products/60/09/35650960/thumb80_grijalice-i-radijatori-trotec-uljni-trh-27-e-2500-w_e7e15b1e.jpeg)
Trotec uljni TRH 27 E, 2500 W
95,99 €
1
ponuda
Stavi u listu želja
![Zilan halogena ZLN2250 2500 W](/slike/products/13/39/17643913/thumb80_zilan-zln2250-2500-w_45b8b544.jpeg)
Zilan halogena ZLN2250 2500 W
od 27,93 €
4
ponude
Stavi u listu želja
![Zilan Radijator uljni, 2500 W, 13 rebara - ZLN8467](/slike/products/27/20/48202027/thumb80_zilan-radijator-uljni-2500-w-13-rebara-zln8467_477faf75.png)
4
ponude
Stavi u listu želja
![VAILLANT RADIJATOR 22K 300/1800 2408W](/slike/products/12/45/51674512/thumb80_grijalice-i-radijatori-vaillant-radijator-22k-300-1800-2408w_d0f2905f.jpeg)
1
ponuda
Stavi u listu želja
![Sencor uljni SOH 3211WH, 2300 W](/slike/products/33/91/7219133/thumb80_sencor-soh-3211wh-uljni-radijator_195bbf0d.jpeg)
Sencor uljni SOH 3211WH, 2300 W
od 81,63 €
2
ponude
Stavi u listu želja
![Električna PTC grijalica Yato YT-99705 3KW](/slike/products/61/38/50803861/thumb80_grijalice-i-radijatori-elektricna-ptc-grijalica-yato-yt-99705-3kw_7e1d5b91.jpeg)
1
ponuda
Stavi u listu želja
![Blum Blum Heat Meister, grijalica za terasu, 2400 W, LED, daljinski upravljač, crna](/slike/products/71/64/19846471/thumb80_blum-blum-heat-meister-grijalica-za-terasu-2400-w_ae9a14f9.jpeg)
1
ponuda
Stavi u listu želja
![Sencor SFH 9014, 2500 W](/slike/products/07/62/5386207/thumb80_sencor-sfh-9014-1300-w-2500-w_9fbb0263.jpeg)
Sencor SFH 9014, 2500 W
od 107,15 €
2
ponude
Stavi u listu želja
![home Radijator uljni sa 13 rebara, 2500W - FKOS 13 M](/slike/products/11/60/19646011/thumb80_home-radijator-uljni-sa-13-rebara-2500w-fkos-13-m_8be2ddbc.jpeg)
2
ponude
Stavi u listu želja
![Sunred zidni grijač Royal Diamond Dark 2500 W ružičasto zlato crni](/slike/products/86/02/17760286/thumb80_sunred-stenski-grelnik-royal-diamond-dark-2500-w-roznato-zlat-in-crn_77edb2b1.jpeg)
2
ponude
Stavi u listu želja
![Klarstein Klarstein Wonderwall Smart Bornholm, infracrvena grijalica, 70x60cm, App, 360W](/slike/products/37/64/49406437/thumb80_grijalice-i-radijatori-klarstein-klarstein-wonderwall-smart-bornholm_c002ee02.jpeg)
Klarstein Klarstein Wonderwall Smart Bornholm, infracrvena grijalica, 70x60cm, App, 360W
od 139,90 €
2
ponude
Stavi u listu želja
![Sencor uljni SOH 3213WH, 2500 W](/slike/products/35/91/7219135/thumb80_sencor-soh-3213wh-500-w_68e489b5.jpeg)
Sencor uljni SOH 3213WH, 2500 W
od 90,13 €
3
ponude
Stavi u listu želja
![Blumfeldt Rising Sun, 2500 W](/slike/products/27/08/7380827/thumb80_blumfeldt-rising-sun_c3dd93c7.jpeg)
Blumfeldt Rising Sun, 2500 W
od 128,90 €
2
ponude
Stavi u listu želja
![Sunred grijač Royal Diamond Dark ružičasto zlato Lounge 3000 W crni](/slike/products/94/51/40625194/thumb80_sunred-grijac-royal-diamond-dark-ruzicasto-zlato-lounge-3000-w-crni_22ca02df.jpeg)
1
ponuda
Stavi u listu želja
![Klarstein Bansin Crystal Smart, konvektorska grijalica, 2500W, 5 - 50 °C, kontrola primjene](/slike/products/76/91/47519176/thumb80_klarstein-bansin-crystal-smart-konvektorska-grijalica-2500w_456782af.jpeg)
Klarstein Bansin Crystal Smart, konvektorska grijalica, 2500W, 5 - 50 °C, kontrola primjene
150,90 €
1
ponuda
Stavi u listu želja
![Ariete uljni radijator Vintage 839, 11 rebara, plava](/slike/products/30/56/18655630/thumb80_ariete-uljani-radijator-ar839gr-plava_e2b62b08.png)
1
ponuda
Stavi u listu želja
![Stiebel Eltron 236529 konvektor CNS 250 TREND 2500 W alpsko-bijela boja](/slike/products/89/22/21072289/thumb80_stiebel-eltron-236529-konvektor-cns-250-trend-2500-w-alpsko-bijela-boja_3cd1d6e6.jpeg)
1
ponuda
Stavi u listu želja
![Zilan Grijalica sa halogenim ( kvarcnim ) grijačem, 2800 W - ZLN6838 19525](/slike/products/91/92/25009291/thumb80_zilan-grijalica-sa-halogenim-kvarcnim-grijacem-2800-w-zln6838-19525_e0e3b844.jpeg)
4
ponude
Stavi u listu želja
![Sencor uljni SOH 8112WH, 2500 W](/slike/products/83/66/12506683/thumb80_sencor-soh-8112wh-500-w_3fd37973.jpeg)
Sencor uljni SOH 8112WH, 2500 W
od 124,48 €
2
ponude
Stavi u listu želja
![Trotec TDS 75, 15000 W](/slike/products/65/82/14838265/thumb80_trotec-tds-75_b02b6b79.png)
Trotec TDS 75, 15000 W
284,75 €
1
ponuda
Stavi u listu želja
![Neo Tools Neo 90-071 grijalica sa ventilatorom 2400W Digitalni termostat](/slike/products/65/12/17721265/thumb80_neo-tools-neo-90-071-grijalica-sa-ventilatorom-2400w-digitalni-termostat_9436d08c.jpeg)
1
ponuda
Stavi u listu želja
![SunDirect IR grijača ploča PE540-Plus](/slike/products/08/41/17764108/thumb80_sundirect-ir-grijaca-ploca-pe540-plus_d5f379a5.jpeg)
1
ponuda
Stavi u listu želja
Proizvođač
Adler (3)
Linea (1)
AEG (0)
Luxell (0)
Aeno (0)
Magnohrom (0)
Airelec (0)
Master (1)
Alpina (0)
Meross (0)
Ardes (0)
Mesko (0)
Argo (0)
Mill (0)
Ariete (1)
Nedis (0)
Ariston (0)
Neo (0)
Atlantic (0)
Noveen (0)
Beha (0)
Ohyama (0)
Beko (0)
Olimpia Splendid (0)
Beper (0)
oneConcept (0)
Bewello (0)
Orion (0)
Black & Decker (0)
Palma (1)
Blaupunkt (1)
Radialight (0)
Blitz (0)
Rowenta (4)
Blumfeldt (9)
Sencor (6)
Bosch (2)
Shumee (0)
Camry (1)
Siku (0)
Cecotec (0)
Simfer (0)
Connect XL (0)
Somogyi (1)
Cordys (0)
Stadler Form (0)
DeLonghi (4)
Stanley (1)
Dimplex (1)
Steba (0)
Domo (0)
Stiebel Eltron (3)
ECG (0)
SunDirect (1)
Einhell (1)
Sygonix (0)
Electrolux (2)
Tansun (1)
Elit (0)
Teesa (0)
Esperanza (0)
Tesla (0)
ETA (0)
Tesy (10)
Falcom (0)
Thermor (2)
Fenix (0)
Trisa (0)
First (0)
Tristar (1)
Floria (0)
Trotec (14)
G3 Ferrari (0)
Ufesa (0)
Gorenje (0)
Unold (0)
Hausmeister (0)
Vaillant (2)
Heinner (2)
Viessmann (0)
Heller (0)
Vivax (3)
Home (1)
Volino (0)
Honeywell (0)
VonHaus (2)
Imetec (0)
Xiaomi (0)
Iskra (3)
Yato (2)
Klarstein (10)
Zilan (13)
Kumtel (0)
Nema podatka (40)
Snaga
000 W - 426 W (63)
000 W (5)
100 W (2)
150 W (2)
167 W (1)
200 W (2)
230 W (1)
235 W (1)
250 W (2)
274 W (1)
280 W (1)
300 W (3)
320 W (3)
340 W (1)
344 W (1)
350 W (9)
357 W (1)
360 W (3)
375 W (1)
379 W (1)
380 W (1)
386 W (1)
400 W (18)
402 W (1)
426 W (1)
430 W - 650 W (93)
430 W (1)
450 W (6)
460 W (1)
480 W (2)
495 W (1)
500 W (25)
526 W (1)
530 W (1)
531 W (1)
533 W (1)
540 W (1)
550 W (1)
552 W (2)
558 W (1)
568 W (1)
577 W (1)
580 W (2)
593 W (1)
600 W (31)
607 W (1)
624 W (1)
633 W (1)
634 W (1)
647 W (1)
650 W (7)
666 W - 1020 W (208)
666 W (1)
668 W (1)
700 W (19)
708 W (1)
720 W (4)
732 W (1)
737 W (1)
750 W (20)
770 W (3)
800 W (23)
810 W (1)
821 W (1)
829 W (1)
830 W (1)
850 W (1)
900 W (15)
931 W (1)
960 W (3)
962 W (1)
968 W (1)
980 W (1)
993 W (1)
1000 W (102)
1020 W (4)
1038 W - 2200 W (669)
1038 W (1)
1075 W (1)
1100 W (3)
1126 W (1)
1150 W (1)
1200 W (66)
1250 W (6)
1276 W (4)
1300 W (3)
1400 W (5)
1500 W (124)
1531 W (4)
1600 W (6)
1610 W (1)
1650 W (1)
1700 W (2)
1800 W (34)
1804 W (1)
1850 W (2)
2000 W (373)
2060 W (1)
2061 W (1)
2100 W (10)
2200 W (18)
2250 W - 15000 W (148)
2250 W (2)
2300 W (5)
2400 W (18)
2406 W (1)
2408 W (1)
2500 W (74)
2700 W (1)
2720 W (1)
2800 W (3)
3000 W (16)
3300 W (1)
3500 W (1)
4200 W (5)
4500 W (1)
5000 W (3)
5500 W (1)
5852 W (1)
6000 W (1)
7741 W (1)
9000 W (4)
12000 W (2)
15000 W (5)
Nema podatka (248)
Moglo bi te zanimati i
Evo zašto svi pričaju o konvektorskim grijalicama