My first Tankless install.....

[master plumber mark]

anything I should know before installing a
Bosch Aquastar tankless water heater for a client???

I dont think that thiis brand is any good



I have gotten myself into a house re-moedl in the heart of the old south side ...
.Basically it is a hell -=-hole but the customer has already bought a Bosch tankless heater
and he is a lawyer who thinks he knows it all.......


I have already told him that it probably is not big enough for his house...
but their is no talking him out of it


anyway....I have decided to use 1/2 wirsbo pex lines
and manifold everything into a 3/4 copper pex manifold right
by the tankless heater....all hot liens will get kicked down to 1/2


though I am debateing wether its is best to have jsut one
hot line going to both bathroooms and teeing off those lines for
the lavatories....instead of running home runs for the lavs tooo...


the vent on this unit will get put out
the side of the house about 9 feet away like a power
vent would but in SS pipe.



3/4 gas line ...

[CHH]

manifold right by the tankless heater....all hot liens will get kicked down to 1/2

Working for the lawyer seems to have you a little shook up: "hot liens" LOL

I tried to resist posting this. Really I did.

[dubldare]

though I am debateing wether its is best to have jsut one [/SIZE]
hot line going to both bathroooms and teeing off those lines for
the lavatories....instead of running home runs for the lavs tooo...

Teeing off will reduce wait time for hot water, eg: Shaving before showering.

Teeing off will also ease installation of a recirc in the future.

[master plumber mark]

I have a 1/2 pex run to the second floor for hot
water and have teed off it for the lav...

will probably do the same for the downstairs bath too
it is just a small modification in the crawl space tomorrow..

with the flow rate being so criticle, it seems better to
runa 1/2 line to a bathroom and teeing of it for the lav
than to run a 3/4 line all the way for both...

I cant bring myself to run a full 3/4 line off that tankless
for a bathroom 45 feet away...
----------------------------------------------------------------------


I have seen one customer actually run only 3/8pex
to all his fixtures from a tankless claiming that the
pressure stays the same but the smaller volume
needing heated makes the tankless function better....

I never went back to see how that worked out.

[GrumpyPlumber]

Mark, if it's not too late...talk him out of the Bosch.
They're the worst...have him get a Takagi, Noritz, Rheem, Rinnai, Paloma...anything but those cheaper box store Bosch's.
If you're stuck with it, you'll see what I mean the first time you check the temperatures.

[master plumber mark]

I have told him to take it back ...

but I think it has fallen on deaf ears...
He is a lawyer and lives on another plane of existence

[Cass]

unless he is a regular past customer you trust...put everything in writing.

[master plumber mark]

I have already told the fellow that the
unit will probably not perform up to the standards
of other units,,

I am thinking about showing him this thread so he can
see for himself. The Bosch is still in the box so it
might be easy to get him to take it back....

if not , its all in writing.

and in bloodtoo