Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual For Natural GAS

Installation instructions

FOR NATURAL GAS

Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.

Follow boxed numbers for piping just one GWH-450-ESR (example: ¾” B.I. Natural Gas pipe for 20 ft (6.1m). will handle 190,000 btu’s (55.7 kWh). For multiple appliances combine the total btu input load and then refer to applicable chart below. Follow the shaded numbers for just one GWH-345-ESR.

Nominal
Iron						Length of Black Iron Pipe, Feet
Pipe	Internal
Size,	Diameter
(inches)	(inches)	10	20	30	40	50	60	70	80	90	100 125	150 175 200

1/4 0.364

3/8 0.493

1/2 0.622

32

72

132

22	18	15	14	12	11	11	10	9	8	8	7	6
49	40	34	30	27	25	23	22	21	18	17	15	14
92	73	63	56	50	46	43	40	38	34	31	28	26

3/4	0.824	278	190	152	130	115		105	96	90	84	79	72	64	59	55
1	1.049	520	350	285	245		215	195	180	170	160	150	130	120	110	100
1 1/4	1.380	1050	730	590	500	440		400	370	350	320	305	275	250	225	210
1 1/2	1.610	1600	1100	890	760	670		610	560	530	490	460	410	380	350	320
2	2.067	3050	2100	1650	1450	1270		1150	1050	990	930	870	780	710	650	610
2 1/2	2.469	4800	3300	2700	2300	2000		1850	1700	1600	1500	1400	1250	1130	1050	980
3	3.068	8500	5900	4700	4100	3600		3250	3000	2800	2600	2500	2200	2000	1850	1700
4	4.026	17,500	12,000	9,700	8,300	7,400		6,80	6,200	5,800	5,400	5,100	4,500	4,100	3,800	3500

Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet

Tube
size,
inches	EHD*
	10		20		30	40		50	60
1/2	18 EHD 82		58		47	41		37	34
3/4	23 EHD	161	116		96	83		75	68
1	30 EHD 330			231	188		162	144	131
1 1/4	37 EHD 639		456		374	325		292	267

*EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.

FOR LP GAS

Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Water Column).

Nominal
iron						Black Iron Pipe
pipe						Length of Pipe, Feet
Inches		10	20	30	40	50	60	80	100	125	150	200
	1/2	291	200	160	137	122	110	94	84	74	67	58
	3/4	608	418	336	287	255	231	197	175	155	140	120
	1	1145	787	632	541	480	434	372	330	292	265	227

*EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.

Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet

Tube
size
inches	EHD*
	10		20		30	40	50		60
1/2	18 EHD	129	91		74	64	58		53
3/4	23 EHD 254			183	151	131	118		107
1	30 EHD 521		365		297	256		227	207
1 1/4	37 EHD 971		661		528	449	397		359

Maximum Capacity of Semi-Rigid (flexible, non

corrugated) Tubing in Thousands of BTU per Hour of

Undiluted Liquefied Petroleum Gases (at 11 inches

Water Column Inlet Pressure).

(Based on a Pressure Drop of 0.5 Inch Water Column)

*Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings

							Copper
Outside					Length of Tubing, Feet
diameter
Inch		10	20	30		40	50	60	70	80	90	100
3/8		39	26	21		19	_	_	_	_	_	_
1/2		92	62	50		41	37	35	31	29	27	26
	5/8	199	131	107		90	79	72	67	62	59	55
	3/4	329	216		181	145	131	121	112	104	95	90

Fig. 26

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